Nozzle assembly of pneumatic dental sand blasting device
阅读说明：本技术 一种气动牙科喷砂装置的喷嘴组件 (Nozzle assembly of pneumatic dental sand blasting device ) 是由 刘伟 刘军 于 2018-09-11 设计创作，主要内容包括：本发明的目的在于提供一种加工成本降低的气动牙科喷砂装置的喷嘴组件及其加工方法。一种气动牙科喷砂装置的喷嘴组件,包括壳体,气体管道,水管道和喷嘴,气体管道和水管道分别与喷嘴固定；壳体一端与喷嘴连接、另一端为接头部；壳体有水管道的进水口；壳体包括外壳和内架,内架在外壳之内；接头部设于内架的一端,气体管道穿过内架的另一端并被锁紧,气体管道和内架的结合锁紧喷嘴、外壳和内架。(The invention aims to provide a nozzle assembly of a pneumatic dental sand blasting device and a processing method thereof, wherein the processing cost is reduced. A nozzle component of a pneumatic dental sand blasting device comprises a shell, a gas pipeline, a water pipeline and a nozzle, wherein the gas pipeline and the water pipeline are respectively fixed with the nozzle; one end of the shell is connected with the nozzle, and the other end of the shell is a joint part; the shell is provided with a water inlet of a water pipeline; the shell comprises an outer shell and an inner frame, and the inner frame is arranged in the outer shell; the joint part is arranged at one end of the inner frame, the gas pipeline penetrates through the other end of the inner frame and is locked, and the combination of the gas pipeline and the inner frame locks the nozzle, the shell and the inner frame.)
1. A nozzle component of a pneumatic dental sand blasting device comprises a shell, a gas pipeline, a water pipeline and a nozzle, wherein the gas pipeline and the water pipeline are respectively fixed with the nozzle; one end of the shell is connected with the nozzle, and the other end of the shell is a joint part; the shell is provided with a water inlet of a water pipeline; the method is characterized in that: the shell comprises an outer shell and an inner frame, and the inner frame is arranged in the outer shell; the joint part is arranged at one end of the inner frame, the gas pipeline penetrates through the other end of the inner frame and is locked, and the combination of the gas pipeline and the inner frame locks the nozzle, the shell and the inner frame.
2. The nozzle assembly of a pneumatic dental blasting apparatus of claim 1, wherein: the inner frame is provided with a locking piece which is tightly matched with the gas pipeline.
3. The nozzle assembly of a pneumatic dental blasting apparatus of claim 1, wherein: the nozzle assembly is provided with a locking piece, the locking piece abuts against the end plate of the inner frame, and the locking piece is fixedly connected with the gas pipeline through a thread pair or is tightly matched with the gas pipeline; the gas conduit has a connecting end exposed from the retaining member.
4. The nozzle assembly of the pneumatic dental blasting apparatus of claim 2 or 3, wherein: the locking piece is a nut, and a threaded section is arranged on the gas pipeline.
5. The nozzle assembly of a pneumatic dental blasting apparatus of claim 1, wherein: the water inlet of water pipeline is located interior frame, has the sealing washer between interior frame and the water pipeline.
6. The nozzle assembly of a pneumatic dental blasting apparatus of claim 1, wherein: the outer surface of the inner frame is provided with a first step, and the inner surface of the outer shell is provided with a second step matched with the first step; the second step is adjacent to the nozzle relative to the first step.
7. The nozzle assembly of the pneumatic dental blasting apparatus of claim 6, wherein: be equipped with the location floor in the shell, location floor and interior frame contact, the location floor has the distance with first step.
8. The nozzle assembly of the pneumatic dental blasting apparatus of claim 7, wherein: the location floor has a plurality ofly, and a plurality of location floors evenly set up along interior frame around.
9. The pneumatic dental blasting apparatus nozzle assembly of claim 8, wherein: the barrel body of the inner frame is cylindrical, and the contact surface of the positioning rib plate and the inner frame is arc-shaped.
10. The nozzle assembly of a pneumatic dental blasting apparatus of claim 1, wherein: one end of the shell is propped against the nozzle, and a limiting part for preventing the shell and the nozzle from rotating mutually is arranged between the combining surfaces of the shell and the nozzle.
Technical Field
The invention relates to the field of dental medical instruments, in particular to a nozzle assembly of a pneumatic dental sand blasting device.
Background
Tooth cleaning is a good tooth health care means and is also the primary measure for treating periodontal disease. The regular tooth cleaning can not only thoroughly remove dental plaque and calculus on teeth, keep the periodontal tissue healthy and prevent and treat periodontal diseases. In addition, when teeth are cleaned, small and inconspicuous odontopathy such as hidden decayed teeth can be easily found, and the aim of early detection and early treatment can be achieved.
The sand blasting tooth cleaning is to clean tea dirt, smoke dirt and substance soft dirt attached to teeth by adding high-pressure water to pearl salt, and the teeth cleaned by sand blasting are very smooth and are not easy to deposit dental calculus again, so that the tooth cleaning and the sand blasting are generally recommended to be carried out in a combined manner.
The pneumatic dental sand blasting device performs tooth treatment through a jet of abrasive powder mixed with air and water, and comprises a machine body assembly and a nozzle assembly, wherein the machine body assembly is connected with the nozzle assembly in a plug-in mode;
the machine body assembly comprises an integrated powder container (also called sand chamber) for storing a predetermined amount of powder, an air supply line for pressurizing air and connected to the inside of the powder container, a delivery line for delivering the powder mixed with air, a water supply line connected to a water source, and a machine body joint connected to a nozzle; one end of the conveying line is connected into the powder container, and the other end of the conveying line is exposed out of the machine body joint; a water outlet of a water supply line is formed in the joint part of the machine body, two sealing rings are axially arranged on the joint of the machine body, and the water outlet is arranged between the two sealing rings;
the nozzle assembly comprises a nozzle housing, a nozzle, a water output line and an air powder output line, the nozzle is provided with a water channel and an air powder channel, and the air powder channel is arranged in the water channel; the nozzle is provided with a water inlet of a water output line and a gas inlet of an air powder output line, and the nozzle shell is hermetically connected with the machine body joint; when the head assembly and the nozzle assembly are connected, the conveying line is connected with the air powder output line.
When the sand blasting machine is used, the machine body assembly and the nozzle assembly are inserted in place, and a water containing gap is formed in the area in front of the two sealing rings; pressurized air and water are input, air powder is sprayed out of the air powder channel through the conveying line and the air powder output line, and water is sprayed out of the water channel through the water supply line, the water containing gap and the water output line.
The prior sand blasting machine has the following defects: 1. the machine body joint and the part connected with the machine body joint in the nozzle shell are made of metal materials, the manufacturing cost is high, and after the machine body joint and the nozzle shell are pulled out and inserted for many times, abrasion occurs between the metals, so that the connection between the machine body assembly and the nozzle assembly is loosened. 2. After the transmission line and the air powder output line are pulled out and inserted for many times, the connection tightness is reduced, and sand leakage and sand blockage are easy to occur. 3. The water channel is annular, and rivers are the annular scattering, and the jet force is less.
Disclosure of Invention
The invention aims to provide a nozzle assembly of a pneumatic dental sand blasting device and a processing method thereof, wherein the processing cost is reduced.
A nozzle component of a pneumatic dental sand blasting device comprises a shell, a gas pipeline, a water pipeline and a nozzle, wherein the gas pipeline and the water pipeline are respectively fixed with the nozzle; one end of the shell is connected with the nozzle, and the other end of the shell is a joint part; the shell is provided with a water inlet of a water pipeline.
The joint part connects the nozzle assembly with the machine body assembly in a sealing manner to form a working sand blasting machine. After the nozzle assembly is connected with the machine body assembly, a water pipeline water spray nozzle of the machine body assembly is connected with a water pipeline water inlet of the nozzle assembly through a sealed containing cavity or space, so that water flow is conveyed from the machine body assembly to the nozzle assembly and then is sprayed out from the nozzle. After the nozzle assembly and the machine body assembly are connected in a sealing mode, the gas pipeline of the machine body assembly is connected with the gas pipeline of the nozzle assembly in a sealing mode, and the powder-air mixture is conveyed to the nozzle assembly from the machine body assembly and then sprayed out from the nozzle. The air nozzle in the nozzle has an inner air nozzle and a water outlet outside the air nozzle.
Shell body
Preferably, the housing and the nozzle are removably engaged, the gas conduit has a threaded portion, the housing has a baffle through which the gas conduit passes and is locked, and the combination of the gas conduit and the housing locks the nozzle and the housing.
As a preferable scheme: the shell comprises an outer shell and an inner frame, and the inner frame is arranged in the outer shell; one end of the inner frame is a joint part, the other end of the inner frame is a baffle plate, the gas pipeline penetrates through the other end of the inner frame and is locked, and the combination of the gas pipeline and the inner frame locks the nozzle, the shell and the inner frame. The gas pipeline of the nozzle assembly penetrates through the connecting end of the inner frame and is communicated with the gas pipeline of the machine body assembly. The outer shell, the inner frame and the nozzle are three independent parts, and the inner frame, the outer shell and the nozzle are combined together while being locked between the gas pipeline and the inner frame.
Preferably, the inner frame includes a barrel, a joint part is provided at a first end of the barrel, and a baffle plate having a through hole for allowing the gas pipe to pass therethrough is provided at a second end opposite to the first end.
Preferably, the inner frame is provided with a locking piece, and the locking piece is tightly matched with the gas pipeline. Preferably, the locking member and the gas pipe are locked by a slope, a key fit, etc.
Preferably, the nozzle assembly is provided with a locking member, the locking member abuts against the baffle plate of the inner frame, and the locking member is fixedly connected with the gas pipeline through a thread pair or is tightly matched with the gas pipeline; the gas conduit has a connecting end exposed from the retaining member. The retaining member is a separate component from the inner frame, and during assembly, the gas conduit is connected to the retaining member and the gas conduit after passing through the retaining plate of the inner frame, and when the retaining member abuts against the inner frame, the retaining member is connected to the gas conduit. Preferably, the locking member is a nut, and the gas pipeline is provided with a threaded section. The nut is engaged with the threaded section. Inner tower and gas pipeline are locked with the retaining member to combine nozzle, shell and inner tower into nozzle assembly, nozzle assembly during the equipment as long as loosen the retaining member can realize the dismantlement to nozzle assembly, be convenient for maintenance and change part.
As preferred scheme, the water inlet of water pipeline is located interior frame, has the sealing washer between interior frame and the water pipeline. The water pipeline is bent to avoid the inner frame, one part of the water pipeline is positioned between the inner frame and the shell, and the sealing ring not only prevents water from entering the area between the inner frame and the shell, but also plays a role in positioning the water pipeline and fixes one end of a water inlet of the water pipeline. Preferably, the stack shell of interior frame has the portion of holding that holds the water pipeling, and the portion of holding is the breach of seting up on the stack shell surface, or the portion of holding is the hole of seting up on the stack shell, and the portion of holding communicates with the water inlet. The containing part plays a limiting role in the water pipeline, and the water inlet end of the water pipeline is fixed by the sealing ring.
As the preferred scheme, the outer surface of the inner frame is provided with a first step, and the inner surface of the outer shell is provided with a second step matched with the first step; the second step is adjacent to the nozzle relative to the first step. The first step moves the housing against the second step in a direction closer to the nozzle as the locking member engages the gas conduit. Preferably, the first step and the second step are both annular steps.
Preferably, a positioning rib plate is arranged in the shell and is in contact with the inner frame, and the positioning rib plate is spaced from the first step. When the combination of the inner frame, the shell and the nozzle is completed, the positioning rib plates and the inner frame are mutually squeezed tightly, so that the inner frame, the gas pipeline and the water pipeline are prevented from shaking. Preferably, the number of the positioning rib plates is multiple, and the plurality of the positioning rib plates are uniformly arranged along the periphery of the inner frame. Preferably, the barrel body of the inner frame is cylindrical, and the contact surface of the positioning rib plate and the inner frame is arc-shaped. Thereby increasing the contact area of the inner frame and the positioning rib plate and improving the positioning stability of the inner frame.
Preferably, the housing and the nozzle are each a separate removable component. Therefore, the shell, the inner frame and the nozzle are independent parts respectively and can be replaced respectively, the parts can be maintained and replaced conveniently, the parts can be manufactured respectively, the structure of a single part is simplified, and the manufacturing cost is reduced.
Preferably, one end of the shell is abutted against the nozzle, and a limiting part for preventing the shell and the nozzle from rotating mutually is arranged between the combining surfaces of the shell and the nozzle. Therefore, after the shell is combined with the nozzle, the shell and the nozzle do not rotate and move, and the stability of the nozzle assembly is kept.
In another preferred embodiment, the housing and the nozzle are fixedly connected, or the housing and the nozzle are integrated. The shell and the nozzle are fixed or integrated, the assembling process is simplified, and the reliability of the connection of the shell and the nozzle is high.
Clamp spring
When the nozzle assembly is combined with the machine body assembly, a C-shaped clamp spring is arranged between the nozzle assembly and the machine body assembly, and the clamping connection of the nozzle assembly and the machine body assembly is realized by utilizing the deformation of the clamp spring.
As the preferred scheme, a C-shaped clamp spring is arranged between the nozzle assembly and the machine body assembly, and two ends of the clamp spring are passivated. If the end is spherical, cambered or chamfered, the end is passivated.
Preferably, the snap spring is mounted at the joint part of the inner frame. The body assembly is provided with a clamp spring groove matched with the clamp spring.
Preferably, each end of the clamp spring is respectively an inclined surface, and the inclined surfaces face the machine body assembly. The inclined plane faces the machine body assembly, and the inclined plane and the inner ring of the clamp spring form an obtuse angle. The inner ring has a small diameter and the outer ring has a large diameter. The inclined plane reduces the wearing and tearing between jump ring and the organism subassembly.
Preferably, the edge of the bevel is a smooth curved surface. When smooth curved surfaces such as bulb, cambered surface are arranged at the two ends of the clamp spring, no cutting is carried out between the clamp spring and the machine body assembly, so that the clamp spring and the machine body assembly can be prevented from being worn mutually when the nozzle assembly is connected with the machine body assembly in a plug-in mode.
Nozzle with a nozzle body
The water and air mixture is sprayed from a nozzle, which is connected to the water and gas conduits, respectively, and which is fixed to the housing.
Preferably, the nozzle comprises a body and a nozzle pipe, the nozzle is respectively connected with the water pipeline and the gas pipeline, the nozzle is provided with a water spraying channel and a gas spraying channel, the gas spraying channel is arranged inside the gas spraying channel, and the water spraying channel is arranged outside the gas spraying channel; the body is tightly matched with the nozzle pipe, a water spraying channel is arranged in the nozzle pipe, a water inlet part and a water guide part are arranged between the nozzle pipe and the body, and the water inlet part is communicated with the water guide part to form the water spraying channel. The areas of the nozzle pipe except the water inlet and spray channel are attached to the body, water can be sprayed out from the outlet of the water spray channel, fixed-point and uniform water outlet is achieved, and the force of spraying water outwards is improved.
Preferably, the water guide part has a plurality of water guide parts, the outlet of the water guide part is used as the outlet of the water spraying channel, and the outlets of the water guide parts are uniformly distributed around the air spraying channel.
Preferably, the body of the nozzle has a water pipe connection passage and a gas pipe connection passage, the water pipe connection passage is fixed with the water pipe, and the gas pipe connection passage is fixed with the gas pipe.
Preferably, the body of the nozzle is provided with a nozzle pipe mounting hole, the nozzle pipe is inserted into the nozzle pipe mounting hole, and the nozzle pipe is tightly matched with the body.
Preferably, the body of the nozzle is formed by MIM injection molding, and the water pipe connecting passage, the air pipe connecting passage and the steel pipe accommodating cavity are formed during injection molding. Accomplish the MIM of body and mould plastics the back, reuse laser welding links to each other water pipeling and water piping connection passageway, links to each other gas pipeline and trachea connecting channel with laser welding, and the steel pipe that impresses nozzle pipe holds the intracavity, nozzle pipe and body interference fit.
In other embodiments, the nozzle has a connector having an air pipe interface, a water pipe interface, and a nozzle pipe interface, the air pipe interface and the water pipe interface are respectively communicated with the nozzle pipe interface, and the connection portion of the air pipe interface and the nozzle pipe interface is staggered with the connection portion of the water pipe interface and the nozzle pipe interface.
When the nozzle is manufactured, the nozzle pipe is fixed in the nozzle pipe connector, an air inlet and a water inlet part are arranged between the nozzle pipe and the nozzle pipe connector, the air inlet is communicated with the air pipe connector and the air injection channel, and the water inlet part is communicated with the water pipe connector and the water injection channel. The connecting piece accomplishes the back with water pipeling, gas pipeline, nozzle union coupling, carries out the moulding plastics of nozzle body, and the nozzle pipe all laminates with the body except that the region of advancing the water spray passageway, and water can only be outwards spout from the water spray passageway, realizes fixed point, even play water, improves the outside strength that sprays of water.
In other embodiments, the gas pipeline, the water pipeline and the nozzle pipe are wrapped on the body of the nozzle, the gas pipeline is provided with a mounting hole, the nozzle pipe is inserted into the mounting hole, and the gas pipeline is communicated with the gas injection channel; the water pipeline is provided with a water spraying opening penetrating through the water pipeline, and the nozzle pipe penetrates through the water spraying opening and the water spraying opening is aligned to the water inlet part.
When the nozzle is manufactured, the nozzle pipe penetrates through a water spray nozzle of a water pipeline and then is inserted into a mounting hole of a gas pipeline, then the nozzle is subjected to injection molding, areas of the nozzle pipe except a water inlet and outlet channel are attached to the body, water can be sprayed out from the water inlet and outlet channel, fixed-point and uniform water outlet is achieved, and the force of water spraying out is improved.
Preferably, the nozzle has an extension connected to the housing, the extension and the nozzle forming a positioning step therebetween. As long as the size change appears between the nozzle and the extension section, a positioning step can appear. When the shell is pressed against the positioning step, the shell is combined with the nozzle in place.
Preferably, the limiting member is disposed between the extending section and the housing, the extending section is inserted into the housing, the limiting member is a protrusion and a groove that are matched with each other, the protrusion is located on the extending section, the groove is located on the housing, or the protrusion is located on the housing, and the groove is located on the extending section. When the projection is inserted into the groove, the rotational freedom of the nozzle and the housing is unified.
Preferably, the protrusion is a rectangular block, and the groove is a rectangular groove.
Preferably, the limiting members are multiple, and the multiple limiting members are uniformly distributed between the housing and the extension section.
Nozzle pipe
The mixture of powder and air is ejected from the inner cavity of the nozzle tube and the water flow is ejected between the nozzle tube and the nozzle.
As a preferred scheme, the nozzle pipe is in a hollow cylindrical shape, the nozzle pipe is provided with an air inlet hole, a water inlet part and a water guide part, the air inlet hole is communicated with the inner cavity of the nozzle pipe, the water inlet part and the water guide part are isolated from the inner cavity of the nozzle pipe, and the water inlet part is positioned between the water pipeline and the water guide part; the outlet of the inner cavity of the nozzle pipe is used as an air nozzle of the nozzle, and the outlet of the water guide part is used as a water spraying port of the nozzle. After the nozzle pipe is matched with the body of the nozzle, the water inlet part and the water guide part are matched with the body of the nozzle to form a water spraying channel, and the water inlet part is used as an inlet of the water spraying channel.
The water inlet part divides the pipe body into an air pipe connecting section and a water guide section, the air inlet hole is positioned in the air pipe connecting section, and the water guide part is positioned in the water guide section.
Preferably, the water guide part is arranged along the axial direction of the nozzle pipe, the water guide part is provided with a plurality of water guide parts, and the plurality of water guide parts are uniformly distributed along the circumference of the nozzle pipe. The part of the water guide section except the water guide part is contacted with the nozzle, and water flow is intensively sprayed out from the water guide part, so that the water flow spraying force is improved, and the water flow is uniformly sprayed out at fixed points.
Preferably, the water guide part is a groove opened on the surface of the nozzle pipe. The cross section of the water guide part is rectangular, semicircular, arc-shaped, V-shaped, U-shaped, L-shaped, trapezoidal and the like.
Or the water guide part is positioned on the water guide section, the water guide section is prismatic, the side surface of the water guide section is used as the water guide part, and the water guide section is internally connected with the excircle of the nozzle pipe. Preferably, the water conducting section is a regular prism. Preferably, the edges of the water guide section are rounded. The prismatic water diversion section is convenient to process, the single-point water yield is stable, and the water yield is high. Preferably, the nozzle pipe is a cylinder with equal outer diameter, and the water inlet part is a circle of concave ring opened on the outer surface of the nozzle pipe. Preferably, the end of the water diversion section is provided with an extension section, the extension section is in a cylindrical ring shape, and the extension section is smaller than the pipe body. Therefore, an annular gap is formed between the extension section and the nozzle, and water flows out through the fixed point of the water guide part and then is converged into a ring at the extension section. When the nozzle is used, the water flow of all the diversion trenches is converged into a beam and then is sprayed out. The length of the extension section does not consume the strength of water flow jet, and the water flow can be converged into a bundle to be jetted.
Preferably, the body of the nozzle pipe is in interference fit with the steel pipe connecting channel of the connecting piece, the air pipe connecting section and the water inlet part are positioned in the connecting piece, and part of the water guide section is exposed out of the connecting piece.
Gas pipeline
The gas pipeline of the nozzle assembly is connected with the gas pipeline of the machine body assembly to form a conveying line for conveying the powder-air mixture.
Preferably, gas conduit one end is fixed with the nozzle, and the other end is the linkage segment that is used for linking to each other with the organism subassembly, has the locking portion with the casing fastening on the gas conduit, and locking portion is adjacent with the linkage segment.
Preferably, the locking portion is externally threaded. The nut is arranged in the shell and engaged with the locking part to achieve the purpose of locking the gas pipeline and the shell.
Preferably, the gas pipeline comprises a pipe body and a connector, the connector is fixed with the pipe body, and the locking part and the connecting section are arranged on the connector. The gas pipeline is formed by combining the connector and the pipe body, the pipe body can still adopt the existing gas pipeline, and only the locking part (such as external threads) needs to be processed on the connector, so that the manufacturing cost is reduced.
Preferably, the locking portion of the connecting head is enlarged relative to the connecting section. Thus, a limit step can be formed between the connecting section and the locking section. The limit step may be an inclined surface. When the connecting section is matched with the machine body assembly, the connecting section is locked at the position of the limiting step through the inclined plane.
Anti-blocking sand blasting machine
The sand blasting machine comprises a machine body assembly and a nozzle assembly, wherein the nozzle assembly and the machine body assembly are respectively provided with respective gas pipelines, a sealing cylinder is arranged between the gas pipeline of the nozzle assembly and the gas pipeline of the machine body assembly and is respectively in sealing connection with the two gas pipelines, and the common connection mode of the machine body assembly and the nozzle assembly with a gap between the two gas pipelines is plug-in connection.
The gas pipeline of the nozzle assembly is connected with the sealing barrel in a sealing mode, the gas pipeline of the engine body assembly is also connected with the sealing barrel, and the sealing barrel serves as a middle cavity to be communicated with the two gas pipelines. The sealing cylinder is of a pipe type with openings at two ends, and connecting parts which are in sealing fit with the two gas pipelines are respectively arranged at two ends of the sealing cylinder. Preferably, a transition cavity is arranged between the gas pipeline of the nozzle assembly and the gas pipeline of the machine body assembly, and the transition cavity is an inner cavity of the sealing cylinder. The export of transition chamber links up with the gas piping of nozzle assembly, and the entry of transition chamber links up with the gas piping of organism subassembly. The connection means that when the air flow enters the transition cavity from the air pipeline of the body assembly, the transition cavity has no obstruction to the air flow, and when the air flow enters the air pipeline of the nozzle assembly from the transition cavity, the air pipeline of the nozzle assembly blocks the air flow object.
As a preferred scheme, two ends of the sealing cylinder are respectively provided with connecting parts which are in sealing fit with the two gas pipelines, wherein one connecting part is a fixed end connecting part, the other connecting part is an inserting end connecting part, the fixed end connecting part is provided with a groove, and the gas pipeline connected with the fixed end connecting part is provided with a bulge which can be embedded into the groove; the connection part of the inserting end is a cavity which is tightly matched with another gas pipeline.
Preferably, the outer end part of the connection part of the plug end is provided with a guide inclined plane.
Preferably, the sealing cylinder is a tube body made of wear-resistant elastic materials such as a silicone tube, a latex tube or a rubber tube.
Preferably, the fixed end connecting part is connected with a gas pipeline of the machine body assembly, and the machine body assembly is provided with a protective shell for wrapping the sealing cylinder in the machine body assembly; the plug end connecting part is connected with a gas pipeline of the nozzle assembly. The protective shell and the gas pipeline clamp the sealing cylinder between the protective shell and the gas pipeline, so that the sealing cylinder has the existing flexibility in a plug-in type with the gas pipeline of the nozzle assembly to realize sealing connection, and has the rigidity to avoid the connection failure caused by the deformation of the sealing cylinder.
Preferably, the connection part of the insertion end is provided with a guide inclined plane. The guide inclined plane is matched with the limit step, and when the gas pipeline is inserted in place, the limit step is close to the guide inclined plane. The contact area of the two inclined surfaces is increased, and the reliability of sealing is improved.
Or the fixed end connecting part is connected with the gas pipeline of the nozzle assembly, and the inserting end connecting part is connected with the gas pipeline of the machine body assembly.
Sand blasting machine
In the using process of the sand blasting machine, the nozzle assembly and the machine body assembly need to be capable of freely and relatively rotating, so that the joint part of the nozzle assembly and the joint part of the machine body assembly need to meet the concentricity requirement after assembly, and the smooth degree of rotation can be ensured.
The pneumatic dental sandblasting machine comprises a nozzle assembly and a machine body assembly, wherein the machine body assembly is provided with a step, and a matching surface matched with the step is arranged on the nozzle assembly; the step or step surface is a plastic piece.
Preferably, the number of the steps is multiple, and the steps are concentric; each step corresponds to one mating surface. Preferably, there are two steps. The two concentric steps support the matching of the nozzle assembly and the machine body assembly, the circle center connecting line of the two steps is used as an axis, and the nozzle assembly and/or the machine body assembly rotate around the axis. Thereby guarantee in the course of the work, the sand cavity of organism subassembly is up all the time, and the air powder mixture can be carried smoothly.
Preferably, a sealing ring for sealing water flow is arranged on the machine body assembly and is positioned between the two concentric steps. That is, the two concentric steps have a certain span, increasing the concentric mating area of the body assembly and the nozzle assembly.
Preferably, the step is a tapered step and the mating surface is a ramp.
Preferably, the matching surface of the nozzle assembly is arranged at the joint part of the nozzle assembly, the step of the machine body assembly is arranged at the joint part of the machine body assembly, the joint part of the nozzle assembly is a plastic part, and the joint part of the machine body assembly is an integrally formed metal part. The joint part of the nozzle assembly is positioned on the inner frame, the inner frame is independent from the shell, and the inner frame can be made of plastic, so that the joint part is made of plastic. At this time, the joint portion of the body assembly only needs to be integrally formed with two concentric steps. The mode of two concentric steps is formed integrally, the direct concentricity of the two steps is reliable, and the processing is convenient.
Or the matching surface of the nozzle assembly is a metal piece, and the step of the machine body assembly is a plastic piece. Preferably, the body assembly comprises a metal fitting body and plastic collars, each plastic collar forming a step, the plastic collars being secured to the fitting body. The plastic lantern ring is fixed on the joint body in the modes of interference fit, bonding, thermoplastic or injection molding and the like.
When the joint part of the nozzle assembly and the joint part of the machine body assembly are both metal pieces, in order to avoid the metal surface from being directly contacted to generate severe abrasion, two plastic lantern rings are arranged on the joint part of the machine body assembly, the plastic lantern rings are contacted with the joint part of the nozzle assembly, and a gap is reserved between the area of the joint part of the machine body assembly except the plastic lantern rings and the joint part of the nozzle assembly. Therefore, the concentricity of the two metal surfaces is prevented from being increased due to direct abrasion.
Sand cavity of sand blasting machine
As the preferred scheme, the sand cavity of the sand blasting machine is internally provided with a marking line with the maximum powder adding amount. The maximum add power marker line may indicate the maximum amount of powder that the customer has when adding.
As the preferred scheme, a pressurized air conveying pipe and a gas pipeline are arranged in the sand cavity, the pressurized
Preferably, the inner surface of the sand chamber is spherical.
Preferably, the body assembly of the sand blasting machine is provided with a mounting part of a sand cavity, the sand cavity is embedded into and fixed on the mounting part, and the sand cavity is provided with a top edge higher than the mounting part; the sand blasting machine is provided with a sand cavity cover, the installation part is provided with a connection part matched with the sand cavity cover, and the sand cavity cover is provided with a sealing ring. After the sand cavity cover and the mounting part are connected in place, the sealing ring is compressed between the sand cavity cover and the top edge. The topside in sand chamber exceeds the installation department, avoids the powder in the sand chamber to fall into in the gap of sand chamber and installation department junction.
Preferably, the outlet aperture of the pressurized
Preferably, the sand chamber has an outwardly extending outer rim, the mounting portion being within the area covered by the outer rim. So, the junction between sand chamber and the installation department is hidden completely in the sand chamber, and during the dusting, the powder can not fall into the connection region between sand chamber and the installation department yet. Preferably, the mounting part and the sand chamber cover are connected by a thread pair.
Preferably, the sand chamber cover has a transparent window. The marking line is in the visible range of the window.
The invention has the advantages that: 1. the shell, the inner frame and the nozzle are three mutually independent parts and can be made of different materials, so that the manufacturing cost is reduced. 2. The inner frame can be made of plastic materials, the joint part is also a plastic part, the plastic joint part of the nozzle assembly is connected with the machine body assembly in a plug-in mode, and abrasion between the nozzle assembly and the machine body assembly is reduced by utilizing self-lubrication and abrasion resistance of the plastic materials. 3. The clamping spring is passivated at the end, so that abrasion among the clamping spring, the machine body assembly and the nozzle assembly is avoided or reduced, and the service time of precise combination of the machine body assembly and the nozzle assembly is prolonged. 5. The nozzle conducts the water flow directionally through the water guide part, so that the sprayed water flow is uniform and the force is concentrated. 6. A sealing cylinder is arranged between the gas pipeline of the machine body assembly and the gas pipeline of the nozzle assembly and is respectively connected with the two gas pipelines in a sealing way, the two gas pipelines are not in direct contact, and the gas pipelines are not abraded; the gas pipeline is a rigid part, the sealing cylinder is a flexible part, the sealing cylinder has good wear resistance and is not easy to deform, and the inserting times of the nozzle assembly and the machine body assembly are increased; the service life of the sand blasting machine is prolonged, and no sand leakage or blockage is guaranteed. 7. The machine body component and the nozzle component are matched through concentric steps, and the machine body component and the nozzle component can rotate smoothly and relatively.
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