Direct writing pen and direct writing device

Abstract

The present invention discloses a direct writing pen and a direct writing device, and relates to the technical field of printing equipment. The direct writing device includes a direct writing pen, including a pen tube, a pen tip, and a feed pipe inside the pen tube for providing raw materials to the inside of the pen tube, the feed pipe extends from the upper end of the pen tube to the inside of the pen tube, so that the lower end of the feed pipe is connected with the inner cavity of the pen tube to form a communicating vessel; the pen tube is provided with a pressure measuring port; a material box is used to store raw materials, and has a discharge port and an adjusting port thereon, and the discharge port is connected with the upper end of the feed pipe; a pressure closed-loop control system is respectively connected with the pressure measuring port and the adjusting port to maintain a constant ink outlet pressure at the pen tip of the direct writing pen. The present invention makes the inside of the direct writing pen into a communicating vessel structure, and then cooperates with the pressure closed-loop control system to keep the raw material liquid level in the inner cavity of the pen tube in a constant state, thereby maintaining the ink outlet pressure at the pen tip at a stable level, thereby solving the problem of unstable ink outlet effect and improving the reliability and stability of the device.

Description

Technical Field

[0001] The invention belongs to the technical field of printing equipment, and in particular relates to a direct writing pen and a direct writing device. Background Art

[0002] The low-melting-point metal printer is a new type of additive manufacturing equipment that uses low-melting-point metals as the printing material of the printer. Compared with traditional printers that use high-melting-point metals as printing materials, the low-melting-point metal printer equipment works in a low-temperature environment and does not require supporting energy facilities, safety facilities, etc. The equipment has low cost, low energy consumption, is safe and reliable, and has no dust or powder discharge, which is healthy and environmentally friendly.

[0003] At present, low-melting-point metal printers mainly use direct writing technology to rely on the low-melting-point metal's own gravity to achieve ink discharge, but the ink discharge pressure at the pen tip is unstable, which can easily cause too little or too much ink to be discharged, seriously affecting the reliability of the printer. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a direct writing device to solve the problem in the prior art that the ink discharge from the pen tip is unstable and affects the reliability of the printer.

[0005] In some illustrative embodiments, the direct writing device includes: a direct writing pen, including a pen tube, a pen tip, and a supply pipe located inside the pen tube for providing raw materials to the inside of the pen tube, the supply pipe extending from the upper end of the pen tube to the inside of the pen tube, so that the lower end of the supply pipe is connected to the inner cavity of the pen tube to form a communicating vessel; the pen tube is provided with a pressure measuring port; a material box, the material box is used to store the raw materials, and has a discharge port and a regulating port thereon, and the discharge port is connected to the upper end of the supply pipe; a pressure closed-loop control system, which is respectively connected to the pressure measuring port and the regulating port to maintain a constant ink discharge pressure at the pen tip of the direct writing pen.

[0006] In some optional embodiments, the raw material is a granular material, and the raw material moves toward the feed tube by gravity; a heating component is provided on the pen tube of the direct writing pen to melt the granular material entering the pen tube into a liquid state.

[0007] In some optional embodiments, the pen tube of the direct writing pen includes an upper pen tube made of a heat-insulating material and a lower pen tube made of a heat-conductive material, and the lower pen tube serves as a molten material section of the pen tube.

[0008] In some optional embodiments, the feed tube includes an upper feed tube made of a heat insulating material and a lower feed tube made of a heat conductive material, and the upper end of the lower feed tube is flush with the upper end of the lower pen tube.

[0009] In some optional embodiments, a gap is left between the inner wall of the feed pipe and the granular material to allow gas to pass through.

[0010] In some optional embodiments, the pressure closed-loop control system includes: a controller, and a pressure sensor and an air pressure output mechanism electrically connected to the controller; the pressure sensor is connected to the pressure measuring port, and the air pressure output mechanism is connected to the regulating port, and positive pressure or negative pressure can be provided through the regulating port.

[0011] In some optional embodiments, the pen tube and the pen tip are connected via a connector.

[0012] In some optional embodiments, an assembly port is provided at the upper end of the pen tube; the direct writing device further includes: a material pipe joint and a material conduit; a fixed connection is formed between the inner wall of the lower interface of the material pipe joint and the outer wall of the upper port of the material pipe, and a fixed connection is formed between the outer wall of the lower interface of the material pipe joint and the assembly port of the pen tube; the upper interface of the material pipe joint is connected to the discharge port of the material box through the material conduit.

[0013] A direct writing device is disclosed in an embodiment of the present invention. The direct writing device can be composed of a direct writing pen, a material box and a pressure closed-loop control system. A feed pipe is provided in the direct writing pen, so that the feed pipe and the inner cavity of the pen tube form a pressure-balanced communicating vessel structure, so that the air pressure in the inner cavity of the pen tube can be maintained at a constant state through the pressure closed-loop control system, and the height of the raw material in the inner cavity of the pen tube is always kept unchanged. At this time, no matter how the height of the raw material in the feed pipe changes, the ink outlet pressure at the pen tip can be kept at a stable level, thereby achieving the effect of controlling the ink outlet stability, thereby ensuring the reliability and stability of the direct writing device.

[0014] Another object of the present invention is to provide a direct writing pen to meet the structural requirements for maintaining the stability of ink discharge from the tip of the direct writing pen.

[0015] In some illustrative embodiments, the direct writing pen includes a pen tube, a pen tip, and a supply tube located inside the pen tube for providing raw materials to the inside of the pen tube. The supply tube extends from the upper end of the pen tube to the inside of the pen tube, so that the lower end of the supply tube is connected to the inner cavity of the pen tube to form a communicating vessel; the pen tube is provided with a pressure measuring port.

[0016] Another object of the present invention is to provide a direct writing pen to achieve the function of controlling the melting of the low-melting-point metal area in the direct writing pen.

[0017] In some illustrative embodiments, the direct writing pen includes a pen tube, wherein the pen tube includes an upper pen tube made of a heat insulating material and a lower pen tube made of a heat conductive material.

[0018] Compared with the prior art, the present invention has the following technical advantages:

[0019] The present invention makes the interior of the direct writing pen into a communicating vessel structure, and then cooperates with a pressure closed-loop control system to keep the raw material liquid level in the inner cavity of the pen tube at a constant state, thereby maintaining the ink outlet pressure at the pen tip at a stable level, thereby solving the problem of unstable ink outlet effect in the prior art and improving the reliability and stability of the direct writing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of a direct writing device in an embodiment of the present invention;

[0021] Figure 2 is a structural schematic diagram of an air pressure output mechanism in a direct writing device in an embodiment of the present invention;

[0022] Figure 3 Schematic diagram of the structure of the direct writing device in the embodiment of the present invention. DETAILED DESCRIPTION

[0023] The following description and the accompanying drawings fully illustrate specific embodiments of the present invention so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The examples represent possible variations only. Unless explicitly required, separate components and functions are optional, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. The scope of the embodiments of the present invention includes the entire scope of the claims, and all available equivalents of the claims. In this article, these embodiments of the present invention may be represented individually or collectively by the term "invention", which is merely for convenience, and if more than one invention is disclosed in fact, it is not intended to automatically limit the scope of the application to any single invention or inventive concept.

[0024] It should be noted that the various technical features in the embodiments of the present invention can be combined with each other without conflict.

[0025] The embodiment of the present invention discloses a direct writing device, such as Figure 1 As shown, Figure 1 The schematic diagram of the structure of the direct writing device in the embodiment of the present invention is shown. The direct writing device comprises: a direct writing pen 100, a material box 200 and a pressure closed-loop control system 300. The direct writing pen 100 is connected with the material box 200. The material box 200 is used to store printing materials 400 and replenish the direct writing pen 100 as the printing materials 400 in the direct writing pen 100 are consumed; the pressure closed-loop control system 300 monitors the ink outlet pressure of the direct writing pen 100 in real time and controls the air pressure in the direct writing pen 100 to maintain the ink outlet pressure of the direct writing pen 100 constant.

[0026] In this embodiment, the printing material 400 can be a low-melting-point metal that is in liquid state at room temperature, such as gallium element, gallium-indium eutectic alloy, gallium-indium-tin eutectic alloy, etc. The printing material 400 maintains a stable ink outlet pressure of the direct writing pen 100 through its own gravity and the changing negative pressure / positive pressure provided by the pressure closed-loop control system 300.

[0027] In some embodiments, the pressure closed-loop control system 300 can be adjusted to the optimal ink output state of the direct writing pen 100 to maintain a constant ink output pressure of the direct writing pen 100. Under this control, the optimal ink output state of the direct writing device can always be maintained.

[0028] Preferably, the pressure closed-loop control system 300 includes a controller 310, an air pressure output mechanism 320 and a pressure sensor 330; wherein the air pressure output mechanism 320 and the pressure sensor 330 are electrically connected to the controller 310 respectively, the pressure sensor 330 is used to detect the pressure of the raw material 400 of the direct writing pen 100, and to feed back to the controller 310 in real time, the controller 310 stores a target pressure value, after the controller 310 obtains the actual pressure value detected in real time by the pressure sensor 330, it compares it with the target pressure value, and then controls the air pressure value in the material box 200 and the direct writing pen 100 by driving the air pressure output mechanism 320, thereby adjusting the actual pressure value detected by the pressure sensor 330 to the target pressure value.

[0029] The air pressure output mechanism 320 can be composed of any device that can provide positive pressure and / or negative pressure, such as a negative pressure air pump controlled by a negative pressure solenoid valve, such as an air pressure valve block, a negative pressure air pump controlled by a negative pressure solenoid valve, and a positive pressure air pump controlled by a positive pressure solenoid valve, wherein the negative pressure air pump is connected to the air pressure valve block through the negative pressure solenoid valve, and the positive pressure air pump is connected to the positive pressure air pump through the positive pressure solenoid valve, and the output air port of the air pressure valve block is used as the output port of the air pressure output mechanism 320 to form a matching connection with the direct writing pen or the material box. The solenoid valve in the air pressure output mechanism 320 is connected to the controller 310 to respond to the control command of the controller 310.

[0030] Specifically, Figure 2As shown, an air pressure output mechanism 320 is proposed in the embodiment of the present invention, comprising: a five-way air pressure valve block 321, an air pump 322, a buffer tank 323, a pressure relief solenoid valve 324, a negative pressure solenoid valve 325, a positive pressure solenoid valve 326 and a throttling muffler 327; wherein the buffer tank 323 is connected to the air pressure valve block 321 to stabilize the air pressure in the air pressure valve block 321; the air inlet of the air pump 322 is connected to the air pressure valve block 321 through the negative pressure solenoid valve 325, the air outlet of the air pump 322 is connected to the air pressure valve block 321 through the positive pressure solenoid valve 326, and the throttling muffler 327 is connected to the air pressure valve block 321 through the pressure relief solenoid valve 324. wherein the negative pressure solenoid valve 325 and the positive pressure solenoid valve 326 are three-way valves, and the third ports of the negative pressure solenoid valve 325 and the positive pressure solenoid valve 326 are respectively connected to the atmosphere.

[0031] When the air pressure output mechanism 320 needs to provide negative pressure, the negative pressure solenoid valve 325 connects the air pressure valve block 321 with the air inlet of the air pump 322, and the positive pressure solenoid valve 326 connects the air outlet of the air pump 322 with the atmosphere, so that the air pressure valve block 321 provides negative pressure. When the air pressure output mechanism 320 needs to provide positive pressure, the positive pressure solenoid valve 326 connects the air pressure valve block 321 with the air outlet of the air pump 322, and the negative pressure solenoid valve 325 connects the air inlet of the air pump 322 with the atmosphere, so that the air pressure valve block 321 provides positive pressure. The pressure relief solenoid valve 324 is used to start the pressure relief solenoid valve 324 when the pressure range in the air pressure valve block 321 exceeds a predetermined value, thereby driving the air pressure value in the air pressure valve block 321 to return to stability.

[0032] The air pressure output mechanism 320 in this embodiment provides both positive and negative pressures through only one air pump, which reduces equipment costs, occupies space, and optimizes the entire pressure closed-loop control system. At the same time, air pressure safety is ensured by setting a pressure relief solenoid valve and a throttling muffler, thereby improving the safety of the device.

[0033] The pressure closed-loop control system 300 in this embodiment has a simple structure and can achieve the effect of accurately controlling the ink pressure of the direct writing pen 100. The controller 310 in the pressure closed-loop control system 300 may refer to a processing element / device such as a processor, a central control board, or a computer.

[0034] Continue to refer to Figure 1In the embodiment of the present invention, a direct writing pen 100 is shown. The direct writing pen 100 includes a pen tube 110, a pen tip 120, and a feed pipe 130 located inside the pen tube 110 for providing printing materials 400 to the inside of the pen tube 110. The pen tip 120 is assembled at the lower end of the pen tube 110 and communicates with the pen tube 110; the feed pipe 130 extends from the upper end of the pen tube 110 to the inside of the pen tube 110, so that the lower end of the feed pipe 130 communicates with the inner cavity of the pen tube 110, and a communicating vessel structure is formed between the feed pipe 130 and the inner cavity of the pen tube 110; the upper end of the feed pipe 130 penetrates the upper end of the pen tube 110, is exposed outside the pen tube 110, and communicates with the material box 200, and the material box 200 is provided with an adjusting air port 201, and the adjusting air port 201 is communicated with the air pressure output mechanism 320.

[0035] In this embodiment, the pen tube 110 and the feed tube 130 of the direct writing pen 100 form two connected cavity structures, and a pressure measuring port 111 is provided on the upper part of the pen tube 110, and the pressure measuring port 111 is connected to the pressure sensor 330 of the pressure closed-loop control system 300; at this time, a closed air cavity 112 connected to the pressure measuring port 111 is formed in the upper part of the inner cavity of the pen tube 110, and the air pressure of the air cavity 112 is always maintained constant through the closed-loop control of the pressure closed-loop control system 300, so that the liquid level of the printing material 400 in the inner cavity of the pen tube 110 can be maintained at a certain level. Due to the principle of communicating vessels, at this time, no matter how the liquid level of the printing material 400 in the feed tube 130 changes, the ink outlet pressure at the pen tip of the direct writing pen 100 can be maintained constant, thereby achieving a stable ink outlet effect.

[0036] The printing material 400 in the embodiment of the present invention may also be a low melting point metal that is solid at room temperature, such as a bismuth-based alloy with a melting point below 130° C., such as a bismuth-indium-tin eutectic alloy. Figure 3 For room temperature solid metal, a heating component 140 is provided on the pen tube 110 of the direct writing pen 100, and the heating component 140 is used to melt the solid raw material entering the pen tube 110 (including the feed tube 130 located inside the pen tube 110) into a liquid state, so that ink can be discharged from the pen tip.

[0037] Among them, before melting, the printing material 400 itself can be a filament material or a granular material. When a filament material is selected, the filament material can be pulled into the pen tube through a matching roller. When a granular material is selected, an inclined surface is designed to realize the autonomous feeding of the granular material in the material box 200 into the direct writing pen 100 through the granular material's own gravity.

[0038] Combination Figure 1 Reference Figure 3 , Figure 3A schematic structural diagram of a direct writing device in an embodiment of the present invention is shown. The pen tube 110 of the direct writing pen 100 in the schematic structural diagram includes an upper pen tube 113 made of a heat insulating material and a lower pen tube 114 made of a heat conductive material. The lower pen tube 114 made of a heat conductive material is used as the molten material section of the pen tube 110, so as to achieve the purpose of controlling the range of the molten material area of ​​the pen tube 110.

[0039] Preferably, the feed tube 130 includes an upper feed tube 131 made of a heat insulating material and a lower feed tube 132 made of a heat conductive material, and the upper end of the lower feed tube 132 is flush with the upper end of the lower pen tube 114. In this embodiment, by designing the lower end of the feed tube 130 to be a heat conductive material, the heat conduction of the molten material section of the direct writing pen 100 can be effectively improved, thereby improving the heat conduction efficiency.

[0040] The upper pen tube 113 and the lower pen tube 114 in the embodiment of the present invention, as well as the upper feed tube 131 and the lower feed tube 132 can be connected and fixed by bonding, clearance fit clamping, threading, etc.

[0041] The heat insulating material in the embodiment of the present invention can refer to any material with poor thermal conductivity known in the prior art, and the heat conducting material can refer to any material with good thermal conductivity known in the prior art. Preferably, the heat insulating material can be polytetrafluoroethylene, and the heat conducting material can be metal material (such as stainless steel).

[0042] In some embodiments, the pen tube 110 and the pen tip 120 may be connected via a connector 150 , and the connector 150 may achieve a stable connection between the pen tip 120 and the pen tube 110 .

[0043] The pen tube 110 and the feed tube 130 of the direct writing pen 100 in the embodiment of the present invention can be an integral structure or a split structure, and then connected by assembly. When it is a split structure, the upper end of the pen tube 110 is provided with an assembly port 115, and the assembly port 115 can form a tight connection with the feed tube 130 and ensure the air tightness of the connection, and can be further optimized by adding sealing parts, applying sealant, etc.

[0044] Preferably, the direct writing pen 100 further includes: a material pipe joint 160 and a material conduit 170; the inner wall of the lower interface of the material pipe joint 160 is fixedly connected to the outer wall of the upper port of the feed pipe 130, and the outer wall of the lower interface of the material pipe joint 160 is fixedly connected to the assembly port 115 of the pen tube 110; the upper interface of the material pipe joint 160 is connected to the material outlet of the material box 200 through the material conduit 170. In some other embodiments, the upper interface of the material pipe joint 160 can omit the material conduit 170 and directly connect to the material box 200.

[0045] In the embodiment of the present invention, when the initial state of the printing material 400 is a filament material or a granular material, a gap is left between the inner wall of the path provided by the printing material 400 from the material box 200 to the direct writing pen 100 to allow gas to pass through, so as to facilitate the regulation of the gas pressure.

[0046] The above-mentioned path may refer to the feed pipe 130 , or a path structure formed by the feed pipe 130 and the material pipe connector 160 , or a path structure formed by the feed pipe 130 , the material pipe connector 160 and the material conduit 170 .

[0047] The melting point range of the printing material 400 in the embodiment of the present invention may be related to the overall temperature resistance of the direct writing pen 100. In the embodiment using polytetrafluoroethylene as the upper pen tube 113 and stainless steel as the lower pen tube 114, the direct writing pen 100 may be suitable for low-melting-point metal elements and low-melting-point metal alloys with a melting point below 300°C.

[0048] Further, the printing material 400 may be a low melting point metal or alloy with a melting point below 300 degrees Celsius, and the composition includes one or more of gallium, indium, tin, zinc, bismuth, lead, cadmium, mercury, sodium, potassium, magnesium, aluminum, iron, cobalt, manganese, titanium, vanadium, boron, carbon, silicon, etc., and the form may be a metal element, an alloy, or a conductive nanofluid formed by mixing metal nanoparticles with a fluid dispersant. Preferably, the liquid metal / liquid alloy includes one or more of mercury, gallium, indium, tin element, gallium-indium alloy, gallium-indium-tin alloy, gallium-tin alloy, gallium-zinc alloy, gallium-indium-zinc alloy, gallium-tin-zinc alloy, gallium-indium-tin-zinc alloy, gallium-tin-cadmium alloy, gallium-zinc-cadmium alloy, bismuth-indium alloy, bismuth-tin alloy, bismuth-indium-tin alloy, bismuth-indium-zinc alloy, bismuth-tin-zinc alloy, bismuth-indium-tin-zinc alloy, tin-lead alloy, tin-copper alloy, tin-zinc-copper alloy, tin-silver-copper alloy, and bismuth-lead-tin alloy.

[0049] A direct writing device is disclosed in an embodiment of the present invention. The direct writing device can be composed of a direct writing pen, a material box and a pressure closed-loop control system. A feed pipe is provided in the direct writing pen, so that the feed pipe and the inner cavity of the pen tube form a pressure-balanced communicating vessel structure, so that the air pressure in the inner cavity of the pen tube can be maintained at a constant state through the pressure closed-loop control system, and the height of the raw material in the inner cavity of the pen tube is always kept unchanged. At this time, no matter how the height of the raw material in the feed pipe changes, the ink outlet pressure at the pen tip can be kept at a stable level, thereby achieving the effect of controlling the ink outlet stability, thereby ensuring the reliability and stability of the direct writing device.

[0050] Combination Figure 1 and Figure 3Another object of the present invention is to provide a direct writing pen to meet the structural requirements for maintaining the stability of ink discharge from the pen tip of the direct writing pen. Specifically, the direct writing pen 100 includes a pen tube 110, a pen tip 120, and a feed pipe 130 located inside the pen tube 110 for providing raw materials 400 to the inside of the pen tube 110. The feed pipe 130 extends from the upper end of the pen tube 110 to the inside of the pen tube 110, so that the lower end of the feed pipe 130 is connected to the inner cavity of the pen tube 110 to form a communicating vessel; the pen tube 110 is provided with a pressure measuring port. The direct writing pen in this embodiment can mainly be used to meet the requirements for controlling the ink discharge pressure of the direct writing pen.

[0051] The improvements and structural connection methods of the direct writing pen involved in the above embodiments of the present invention can also directly illustrate other modified embodiments of the direct writing pen. Since they have been mentioned above, they will not be repeated here.

[0052] Combination Figure 1 and Figure 3 Another object of the present invention is to provide a direct writing pen to achieve the function of controlling the melting of the low melting point metal area in the direct writing pen. Specifically, the direct writing pen 100 includes a pen tube 110, and the pen tube 110 includes an upper pen tube 113 of a heat insulating material and a lower pen tube 114 of a heat conductive material. The direct writing pen in this embodiment can mainly be used to achieve a good melting effect.

[0053] The improvements and structural connection methods of the direct writing pen involved in the above embodiments of the present invention can also directly illustrate other modified embodiments of the direct writing pen. Since they have been mentioned above, they will not be repeated here.

[0054] Those skilled in the art will also appreciate that the various illustrative logic blocks, modules, circuits, and algorithmic steps described in conjunction with the embodiments herein can all be implemented as electronic hardware, computer software, or a combination thereof. In order to clearly illustrate the interchangeability between hardware and software, various illustrative components, blocks, modules, circuits, and steps are generally described above around their functions. Whether such functions are implemented as hardware or software depends on specific applications and the design constraints imposed on the entire system. A skilled person can implement the described functions in an alternative manner for each specific application, but such implementation decisions should not be interpreted as departing from the scope of protection of the present disclosure.

Claims

1. A direct writing device, characterized in that: include: A direct writing pen comprises a pen tube, a pen tip, and a feed pipe located inside the pen tube for supplying raw materials to the inside of the pen tube, wherein the feed pipe extends from the upper end of the pen tube to the inside of the pen tube, so that the lower end of the feed pipe is connected to the inner cavity of the pen tube to form a communicating vessel; the pen tube is provided with a pressure measuring port; A material box, the material box is used to store the raw materials, and has a material outlet and a regulating air outlet, and the material outlet is communicated with the upper end of the feed pipe; A pressure closed-loop control system, connected to the pressure measuring port and the regulating port respectively, for maintaining a constant ink outlet pressure at the pen tip of the direct writing pen; The pressure closed-loop control system comprises: a controller, and a pressure sensor and an air pressure output mechanism electrically connected to the controller; the pressure sensor is connected to the pressure measuring port, the air pressure output mechanism is connected to the regulating port, and positive pressure or negative pressure is provided through the regulating port; The raw material is a granular material, and the raw material moves toward the feed tube by gravity; a heating component is provided on the pen tube of the direct writing pen to melt the granular material entering the pen tube into a liquid state; A gap is left between the inner wall of the feed pipe and the granular material to allow gas to pass through.

2. The direct writing device according to claim 1, characterized in that: The pen tube of the direct writing pen comprises an upper pen tube made of a heat insulating material and a lower pen tube made of a heat conductive material, and the lower pen tube serves as a melting material section of the pen tube.

3. The direct writing device according to claim 2, characterized in that: The feed pipe comprises an upper feed pipe made of heat insulating material and a lower feed pipe made of heat conductive material, and the upper end of the lower feed pipe is flush with the upper end of the lower pen tube.

4. The direct writing device according to claim 1, characterized in that: The pen tube and the pen tip are connected via a connector.

5. The direct writing device according to claim 1, characterized in that: The upper end of the pen tube is provided with an assembly opening; The direct writing device further comprises: a material pipe joint and a material conduit; The inner wall of the lower interface of the material pipe joint is fixedly connected to the outer wall of the upper port of the material conduit, and the outer wall of the lower interface of the material pipe joint is fixedly connected to the assembly port of the pen tube; The upper interface of the material pipe joint is communicated with the material outlet of the material box through a material conduit.

Images