Ceramic core mold for ceramic pipe fitting

Abstract

The present application relates to a ceramic core mold, and discloses a ceramic core mold for a ceramic pipe fitting, which comprises an upper mold plate, a lower mold plate, a first core pulling assembly and a second core pulling assembly; the first core pulling assembly comprises a first core pulling rod, and the second core pulling assembly comprises a second core pulling rod and a third core pulling rod; a middle part of a first cylindrical channel is provided with a first forming cavity, and a cavity wall surface of a front end of the first forming cavity is provided with a first threaded part; a front half of the first core pulling rod is located in the first forming cavity; an outer circumferential surface of a front end of the second core pulling rod is provided with a second threaded part; a middle part of a second cylindrical channel is provided with a second forming cavity, and the second threaded part and a part of an arc segment of the third core pulling rod are located in the second forming cavity; the second threaded part is screw-connected and matched with the first threaded part; the cavity wall of the first forming cavity and the cavity wall of the second forming cavity are respectively connected with a slurry output end of a grouting flow channel. The forming of the screw-connectable ceramic straight pipe fitting and the ceramic elbow pipe fitting can be completed through one-time grouting.

Description

Technical Field

[0001] This invention relates to the field of ceramic core mold technology, and more particularly to a ceramic core mold for ceramic pipe fittings. Background Technology

[0002] Ceramic fittings have excellent high-temperature resistance properties, so they are used in argon arc welding torches to house the gas guide tube and tungsten needle.

[0003] Existing TIG welding torches include straight-tube TIG welding torches for welding surface gaps and bent-tube TIG welding torches for welding gaps located inside the cavity of an appliance.

[0004] The ceramic tube fittings for the bent-tube type TIG welding torch consist of two parts: a hollow ceramic straight tube fitting for mounting the gas guide tube and tungsten needle, and a hollow ceramic bent tube fitting for connecting the tungsten needle to the electrode.

[0005] If the bent rod and straight rod are connected as a single core-pulling component, and then the core is pulled out from the integral ceramic molded body formed by slip casting, the bent rod is prone to breakage.

[0006] If the bent rod and the straight rod are to be divided into two parts, and the two parts need to be connected as one; if adhesive is used for bonding, the adhesive is prone to aging at high temperatures, and the performance of the bonding method cannot meet the requirements.

[0007] Ceramic parts are hard but brittle, easily cracked under stress, and cannot be connected by machining matching threads. Summary of the Invention

[0008] To address the aforementioned shortcomings, the present invention aims to provide a ceramic core mold for ceramic pipe fittings, which forms two screw-connectable pipe fittings for straight and bent ceramic pipe fittings.

[0009] To achieve this objective, the present invention adopts the following technical solution: A ceramic core mold for ceramic pipe fittings, used for forming ceramic pipe fittings for bent-pipe type argon arc welding guns, includes an upper template, a lower template, a first core-pulling assembly, and a second core-pulling assembly; The ceramic core mold is provided with a slurry injection channel, a first cylindrical channel and a second cylindrical channel for injecting ceramic slurry; the upper mold plate is provided with a first mold closing plane and the lower mold plate is provided with a second mold closing plane; the first mold closing plane and the second mold closing plane abut against each other and form a mold closing surface; the slurry injection channel, the first cylindrical channel and the second cylindrical channel are respectively symmetrically divided into two halves with the mold closing surface as the plane of symmetry. The upper parts of the grouting channel, the first cylindrical channel, and the second cylindrical channel are respectively formed on the first mold closing plane, and the lower parts of the grouting channel, the first cylindrical channel, and the second cylindrical channel are respectively formed on the second mold closing plane. The first core-pulling assembly includes a first core-pulling rod of straight rod shape, and the second core-pulling assembly includes a second core-pulling rod of straight rod shape and a third core-pulling rod of semi-circular shape; The first cylindrical channel has a cylindrical first forming cavity in the middle, and the cavity wall at the front end of the first forming cavity has a first threaded portion; the front half of the first core-pulling rod is located in the first forming cavity; the rear end of the first core-pulling rod extends backward and is exposed outside the ceramic core mold. The front end of the second core-pulling rod is detachably connected to one end of the third core-pulling rod; the outer circumferential surface of the front end of the second core-pulling rod is provided with a second threaded portion; the middle part of the second cylindrical channel is provided with a curved cylindrical second forming cavity, and the second threaded portion and part of the curved section of the third core-pulling rod are located in the second forming cavity; the other end of the third core-pulling rod and the rear end of the second core-pulling rod extend and protrude from the ceramic core mold respectively; The second threaded portion is screwed into and matched with the first threaded portion; the cavity wall of the first molding cavity and the cavity wall of the second molding cavity are respectively connected to the slurry output end of the grouting channel.

[0010] Furthermore, the first core-pulling rod includes a thicker part and a thinner part; The outer peripheral surface of the front end of the thick part is provided with a third threaded part; the rear end of the thin part is embedded in or connected to the front end of the thick part; the axis of the thick part and the axis of the thin part are the same straight line, and the diameter of the thick part is larger than the diameter of the thin part; The rear half of the thick portion extends rearward and is exposed outside the ceramic core mold; The first molding cavity is divided into a rear cavity and a front cavity; the front half of the thick body is located in the rear cavity, and the thin body is located in the front cavity.

[0011] Furthermore, it also includes an insert; the insert is provided with a through hole, and the inner wall surface of the through hole is provided with the first threaded portion; The insert is divided into two mirror-symmetrical halves, and the through hole extends from front to back through the center of the insert. The upper template and the lower template are each provided with two recessed insert grooves; the two insert grooves are symmetrically distributed vertically with respect to the mold closing surface, and the insert grooves are located at the front end of the front cavity; the two insert grooves are respectively used to receive the two halves of the insert; The front end of the larval part passes through the front cavity and the through hole sequentially from back to front, and the gap between the threaded inner wall of the through hole and the front end inner wall of the front cavity is connected to the front cavity.

[0012] Furthermore, the first core-pulling assembly also includes a first external connector; the first cylindrical channel is also provided with a thicker part fixing cavity and a thinner part fixing cavity; The thick body fixing cavity extends from the rear end face of the ceramic core mold and connects to the rear end of the rear cavity; The rear half of the thick part passes through the fixing cavity of the thick part and is connected to the first external connector. The front end face of the first external connector abuts against the rear end face of the ceramic core mold. The rear end of the larval body fixing cavity is connected to the through hole; the front end of the larval body extends into the larval body fixing cavity through the through hole, and the groove wall of the larval body fixing cavity abuts against the outer peripheral surface of the larval body.

[0013] Furthermore, the second core-pulling assembly also includes a second external connector and a third external connector; The ceramic core mold is also provided with a ring-shaped core-pulling cavity, which is divided into upper and lower halves and recessed inward on the right end face of the upper template and the right end face of the lower template, respectively; the ring-shaped core-pulling cavity is provided with a connector placement groove. The second cylindrical channel is also provided with a second core-pulling rod fixing cavity in the form of a cylinder and a third core-pulling rod fixing cavity in the form of a curved cylinder; The second core-pulling rod fixing cavity extends from the rear end face of the ceramic core mold and communicates with the second molding cavity. The rear end of the second core-pulling rod extends along the second core-pulling rod fixing cavity and connects with the front end face of the second external connector. The front end face of the second external connector abuts against the rear end face of the ceramic core mold. The annulus containing the axis of the third core-pulling rod fixing cavity, the annulus containing the axis of the second forming cavity, and the annulus containing the axis of the third core-pulling rod of the semi-circular cylinder are all the same circle. The third core-pulling rod fixing cavity extends along the circle to the front cavity wall of the core-pulling cavity of the annulus component. The other end of the third core-pulling rod extends along the fixing cavity of the third core-pulling rod and is connected to the front end face of the third external connector. The front end face of the third external connector abuts against the front cavity wall of the core-pulling cavity of the annular component. The connector placement groove is recessed inward in the middle of the left cavity wall of the annular core-pulling cavity. The connector placement groove is used to place the third external connector connected to the third core-pulling rod. The distance between the axis of the connector placement groove and the vertex of the left inner corner of the annular core-pulling cavity, and the distance between the center point of the annular core-pulling rod fixing cavity located on the front cavity wall of the annular core-pulling cavity and the vertex of the left inner corner of the annular core-pulling cavity are all equal to the radius of the circle.

[0014] Furthermore, the grouting channel is provided with an injection port, a first grout outlet, and a second grout outlet; The grouting channel is distributed between the second molding cavity and the front cavity; The injection port is located on the rear end face of the ceramic core mold; The tail end of the grouting channel extends forward in a horizontal direction to the middle of the front cavity, and then connects to the middle cavity wall of the front cavity and the cavity wall of the corresponding second threaded part of the second forming cavity through the first grout outlet and the second grout outlet, respectively.

[0015] Furthermore, the middle part of the grouting channel is also provided with a material head receiving cavity; The width and height of the material receiving cavity are both greater than the width and height of the other parts of the grouting channel.

[0016] Furthermore, the ceramic core mold also has two locking holes; The two locking holes pass through the two diagonally opposite corners of the upper template and the two diagonally opposite corners of the lower template from top to bottom; the locking holes are provided with internal threads.

[0017] Furthermore, the ceramic core mold also has two mold opening notches; The two mold opening notches are located at two diagonal corners of the upper template and are recessed upwards at the two corners of the upper template.

[0018] The beneficial effects of the technical solution of the present invention are as follows: The ceramic core mold of the ceramic pipe fitting is provided with a first forming cavity and a second forming cavity, which can be used to form ceramic pipe fittings and ceramic bent pipe fittings respectively. Ceramic slurry containing forming wax is injected through the slurry flow channel through the first gap and the second gap. After the ceramic slurry solidifies and forms, the first core-pulling rod and the second core-pulling rod are turned and pulled out from the first forming cavity and the second forming cavity respectively. Then, the other end of the second forming cavity away from the second core-pulling rod is pulled along the ring where the third core-pulling rod is located, so that part of the curved section of the third core-pulling rod located in the second forming cavity can be pulled out. Then the mold is opened, and hollow ceramic straight pipe fittings and hollow ceramic bent pipe fittings are obtained by slurry molding. The outer circumferential surface of one end of the ceramic straight pipe fitting is distributed with external threads, and the inner hole of one end of the ceramic bent pipe fitting is distributed with internal threads, so that the sintered and hardened ceramic straight pipe fittings and ceramic bent pipe fittings can be screwed together as one piece. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the component structure of the ceramic core mold for the ceramic pipe fitting of the present invention; Figure 2 This is a schematic diagram of the upper template of the ceramic core mold of the ceramic pipe fitting of the present invention; Figure 3 This is a schematic diagram of the installation structure of the lower template of the ceramic core mold of the ceramic pipe fitting of the present invention, and the first core-pulling assembly and the second core-pulling assembly; Wherein: Upper template 1; Lower template 2; First core-pulling assembly 3; Second core-pulling assembly 4; Insert 5; First mold closing plane 10; Grouting channel 11; Second cylindrical channel 12; First cylindrical channel 13; Circular core-pulling cavity 14; Insert slot 15; Second mold closing plane 20; First external connector 31; First core-pulling rod 32; Second external connector 41; Second core-pulling rod 42; Third core-pulling rod 43; Third external connector 44; Through hole 51; Mold locking hole 101; Mold opening notch 102; Injection port 111; First grouting... Liquid outlet 112; second slurry outlet 113; material head receiving cavity 114; second forming cavity 121; second core-pulling rod fixing cavity 122; third core-pulling rod fixing cavity 123; first forming cavity 131; thick body fixing cavity 132; thin body fixing cavity 133; connector placement groove 141; thick body 321; thin body 322; second threaded part 421; first threaded part 510; second gap 1201; first gap 1301; rear cavity 1311; front cavity 1312; third threaded part 3211. Detailed Implementation

[0020] The following is in conjunction with the appendix Figures 1-3 The technical solution of the present invention will be further illustrated through specific embodiments.

[0021] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] A ceramic core mold for ceramic pipe fittings, used for forming ceramic pipe fittings for bending type argon arc welding guns, includes an upper template 1, a lower template 2, a first core-pulling assembly 3, and a second core-pulling assembly 4; The ceramic core mold is provided with a slurry injection channel 11, a first cylindrical channel, and a second cylindrical channel 12 for injecting ceramic slurry; the upper mold plate 1 is provided with a first mold closing plane 10, and the lower mold plate 2 is provided with a second mold closing plane 20; the first mold closing plane 10 and the second mold closing plane 20 abut against each other and form a mold closing surface; the slurry injection channel 11, the first cylindrical channel 13, and the second cylindrical channel 12 are respectively symmetrically divided into two halves with the mold closing surface as the plane of symmetry; The upper parts of the grouting channel 11, the first cylindrical channel 13, and the second cylindrical channel 12 are respectively formed on the first mold closing plane 10, and the lower parts of the grouting channel 11, the first cylindrical channel 13, and the second cylindrical channel 12 are respectively formed on the second mold closing plane 20. The first core-pulling assembly 3 includes a first core-pulling rod 32 of straight rod shape, and the second core-pulling assembly 4 includes a second core-pulling rod 42 of straight rod shape and a third core-pulling rod 43 of semi-circular shape; The first cylindrical channel 13 has a cylindrical first forming cavity 131 in the middle, and the cavity wall surface at the front end of the first forming cavity 131 has a first threaded portion 510; the front half of the first core-pulling rod 32 is located in the first forming cavity 131; the rear end of the first core-pulling rod 32 extends backward and is exposed outside the ceramic core mold. The front end of the second core-pulling rod 42 is detachably connected to one end of the third core-pulling rod 43; the outer peripheral surface of the front end of the second core-pulling rod 42 is provided with a second threaded portion 421; the middle part of the second cylindrical channel 12 is provided with a curved cylindrical second forming cavity 121, and the second threaded portion 421 and part of the curved section of the third core-pulling rod 43 are located in the second forming cavity 121; the other end of the third core-pulling rod 43 and the rear end of the second core-pulling rod 42 extend and are exposed in the ceramic core mold respectively; The second threaded portion 421 is screwed into and matched with the first threaded portion 510; the cavity wall of the first forming cavity 131 and the cavity wall of the second forming cavity 121 are respectively connected to the slurry output end of the grouting channel 11.

[0024] Figures 1-3 This is a schematic diagram of the ceramic core mold for the ceramic pipe fitting of the present invention. In the figure, a first gap 1301 is provided between the outer peripheral surface of the first core-pulling rod 32 and the cavity wall surface of the first forming cavity 130; a second gap 1201 is provided between the inner cavity surface of the second forming cavity 121 and the outer peripheral surface of the second core-pulling rod 42 and the outer peripheral surface of the first core-pulling assembly 3; the first gap 1301 and the second gap 1201 are respectively connected to the slurry output end of the slurry channel 11 to inject slurry and form a ceramic straight pipe fitting and a ceramic bent pipe fitting.

[0025] The ceramic core mold of the ceramic pipe fitting of the present invention is provided with a first forming cavity 131 and a second forming cavity 121 for forming ceramic pipe fittings and ceramic bent pipe fittings, respectively. Ceramic slurry containing forming wax is injected through the slurry flow channel 11 into the first gap 1301 and the second gap 1201. After the ceramic slurry solidifies and forms, the first core-pulling rod 32 and the second core-pulling rod 42 are twisted and pulled out from the first forming cavity 131 and the second forming cavity 121, respectively. Then, the other end of the second forming cavity 121 away from the second core-pulling rod 42 is pulled along the ring where the third core-pulling rod 43 is located, so that part of the curved section of the third core-pulling rod 43 located in the second forming cavity 121 can be pulled out. Then the mold is opened, and hollow ceramic straight pipe fittings and hollow ceramic bent pipe fittings are obtained by slurry molding. The outer circumferential surface of one end of the ceramic straight pipe fitting is distributed with external threads, and the inner hole of one end of the ceramic bent pipe fitting is distributed with internal threads, so that the sintered and hardened ceramic straight pipe fittings and ceramic bent pipe fittings can be screwed together as one piece.

[0026] Furthermore, the first core-pulling rod 32 includes a thicker portion 321 and a thinner portion 322; The outer peripheral surface of the front end of the thick part 321 is provided with a third threaded part 3211; the rear end of the thin part 322 is embedded in or connected to the front end of the thick part 321; the axis of the thick part 321 and the axis of the thin part 322 are the same straight line, and the diameter of the thick part 321 is larger than the diameter of the thin part 322. The rear half of the thick portion 321 extends rearward and is exposed outside the ceramic core mold; The first molding cavity 131 is divided into a rear cavity 1311 and a front cavity 1312; the front half of the thick body part 321 is located in the rear cavity 1311, and the thin body part 322 is located in the front cavity 1312.

[0027] like Figures 1-3 As shown, after the gap between the outer peripheral surface of the front half of the thick body portion 321 and the cavity wall surface of the rear cavity portion 1311 is formed by grouting, a hollow ceramic straight tube head is formed, and the third threaded portion 3211 forms an internal thread of the ceramic straight tube head.

[0028] After grouting, the gap between the outer peripheral surface of the larval part 322 and the cavity wall surface of the front cavity part 1312 is formed into a hollow straight tube part that connects to the head; the tail end of the tungsten electrode needle of the argon arc gun passes through the head and straight tube part of the ceramic straight tube in sequence and is connected to the electrode. The gap between the outer peripheral surface of the tungsten electrode needle and the inner wall of the head is used to install the gas guide sleeve. The external thread of the outer peripheral surface of the gas guide sleeve is screwed into the internal thread of the head of the ceramic tube.

[0029] Furthermore, it also includes an insert 5; the insert 5 is provided with a through hole 51, and the inner wall surface of the through hole 51 is provided with the first threaded portion 510; The insert 5 is divided into two mirror-symmetrical halves, and the through hole 51 extends from front to back through the center of the insert 5. The upper template 1 and the lower template 2 are each provided with two recessed insert grooves 15; the two insert grooves 15 are symmetrically distributed above and below the mold closing surface, and the insert grooves 15 are located at the front end of the front cavity 1312; the two insert grooves 15 are respectively used to receive the two halves of the insert 5; The front end of the larval part 322 passes through the front cavity 1312 and the through hole 51 sequentially from back to front. The gap between the threaded inner wall of the through hole 51 and the front end inner wall of the front cavity 1312 is connected to the front cavity 1312.

[0030] like Figures 1-3 As shown, it is difficult to machine the arc surface of the two semi-cylindrical first cylindrical channel 13 to form the first threaded part 510. However, it is obviously more convenient to operate by using the insert 5 to open the through hole 51 and then machining the inner wall of the through hole 51 into the first threaded part 510.

[0031] After the front end of the first gap 1301 is grouted and formed, the tail of the straight tube is formed accordingly. The outer peripheral surface of the tungsten electrode needle's tail abuts against the inner wall of the tail of the straight tube. The end of the tungsten electrode needle's tail that passes through the tail of the straight tube is connected to the electrode. The gap between the remaining part of the tungsten electrode needle and the remaining part of the straight tube forms an inert gas guide gap.

[0032] Furthermore, the first core-pulling assembly 3 also includes a first external connector 31; the first cylindrical channel 13 is also provided with a thicker part fixing cavity 132 and a thinner part fixing cavity 133; The thick body fixing cavity 132 extends from the rear end face of the ceramic core mold and communicates with the rear end of the rear cavity 1311; The rear half of the thick part 321 passes through the thick part fixing cavity 132 and is connected to the first external connector 31. The front end face of the first external connector 31 abuts against the rear end face of the ceramic core mold. The rear end of the larval body fixing cavity 133 is connected to the through hole 51; the front end of the larval body 322 extends into the larval body fixing cavity 133 through the through hole 51, and the groove wall of the larval body fixing cavity 133 abuts against the outer peripheral surface of the larval body 322.

[0033] like Figures 1-3 As shown, the rear half of the thick part 321 is fixed by the first external connector 31 and the thick part fixing cavity 132, and the front end of the thin part 322 is fixed by the thin part fixing cavity 133, thereby improving the stability of the first core-pulling rod 32 during the grouting process and preventing the ceramic straight tube from deforming during the molding process.

[0034] Furthermore, by turning the first external connector 31, the coarse part 321 and the thin part 322 with threads distributed on their surfaces are rotated. After the two pairs of corresponding threaded parts separate, the coarse part 321 and the thin part 322 can be pulled out by grasping the first external connector 31 and pulling it outward. This has good operational convenience. The movable parts in the core-pulling process also have good stability. Therefore, it can avoid damage to the slurry-cast ceramic straight pipe fittings during core-pulling, and can improve the finished product qualification rate of ceramic straight pipe fittings.

[0035] Furthermore, the second core-pulling assembly 4 also includes a second external connector 41 and a third external connector 44; The ceramic core mold is also provided with a ring-shaped core-pulling cavity 14, which is divided into upper and lower halves and is recessed inward on the right end face of the upper template 1 and the right end face of the lower template 2, respectively; the ring-shaped core-pulling cavity 14 is provided with a connector placement groove 141. The second cylindrical channel 12 is also provided with a second core-pulling rod fixing cavity 122 of cylindrical shape and a third core-pulling rod fixing cavity 123 of curved cylindrical shape; The second core-pulling rod fixing cavity 122 extends into the rear end face of the ceramic core mold and communicates with the second molding cavity. The rear end of the second core-pulling rod 42 extends along the second core-pulling rod fixing cavity 122 and connects with the front end face of the second external connector 41. The front end face of the second external connector 41 abuts against the rear end face of the ceramic core mold. The annulus containing the axis of the third core-pulling rod fixing cavity 123, the annulus containing the axis of the second forming cavity 121, and the annulus containing the axis of the third core-pulling rod 43 of the semi-circular cylinder are all the same circle. The third core-pulling rod fixing cavity 123 extends along the circle to the front cavity wall of the annulus core-pulling cavity 14. The other end of the third core-pulling rod 43 extends along the third core-pulling rod fixing cavity 123 and is connected to the front end face of the third external connector 44. The front end face of the third external connector 44 abuts against the front cavity wall of the annular core-pulling cavity 14. The connector placement groove 141 is recessed inward into the middle of the left cavity wall of the annular core-pulling cavity 14. The connector placement groove 141 is used to place the third external connector 44 connected to the third core-pulling rod 43. The distance between the axis of the connector placement groove 141 and the vertex of the left inner corner of the annular core-pulling cavity 14, and the distance between the center point of the circle where the cavity wall of the third core-pulling rod fixing cavity 123 located on the front cavity wall of the annular core-pulling cavity 14 is located and the vertex of the left inner corner of the annular core-pulling cavity 14 are all equal to the radius of the circle.

[0036] like Figures 1-3 As shown, by turning the second external connector 41, the second core-pulling rod 42 with threads on its surface is rotated. After the corresponding threads are separated, the second core-pulling rod 42 is pulled out by grasping the second external connector 41. The operation is convenient and stable, which can prevent the internal thread of the slurry-cast ceramic bent pipe from being damaged during the core-pulling process, and can improve the finished product qualification rate of the ceramic bent pipe.

[0037] Furthermore, by clamping the third external connector 44 with a fixture and using the left inner corner of the annular core-pulling cavity 14 as the center support point for the rotation of the fixture, the fixture is rotated to allow the third core-pulling rod 43 of the semi-circular cylinder to be pulled out along the annular third core-pulling rod fixing cavity 123. This causes the portion of the third core-pulling rod 43 located in the second forming cavity 121 to be pulled out of the second forming cavity 121, and finally allows the third external connector 44 to extend into the connector placement groove 141. The portion of the third core-pulling rod 43 located in the second forming cavity 121 during molding is then located in the third core-pulling rod fixing cavity 123 after being pulled out. After completing these operations, the mold is opened, which can prevent the ceramic bent pipe from being damaged when the third core-pulling rod 43 is pulled out, further improving the integrity of the ceramic bent pipe and the finished product qualification rate.

[0038] Furthermore, the grouting channel 11 is provided with an injection port 111, a first grout outlet 112, and a second grout outlet 113; The grouting channel 11 is distributed between the second molding cavity 121 and the front cavity 1312; The injection port 111 is located on the rear end face of the ceramic core mold; The tail end of the grouting channel 11 extends forward in the horizontal direction to the middle of the front cavity 1312, and then connects to the middle cavity wall of the front cavity 1312 and the cavity wall of the corresponding second threaded portion 421 of the second molding cavity 121 through the first grout outlet 112 and the second grout outlet 113, respectively.

[0039] like Figure 2 As shown, since the front cavity 1312 is longer and smaller in diameter than the rear cavity 1311 where the thick body 321 is placed, the ceramic slurry can be introduced from the middle of the front cavity 1312. This reduces the decrease in the flow rate and pressure of the ceramic slurry in the front cavity 1312, thereby preventing the pressure of the ceramic slurry in the front cavity 1312 and the rear cavity 1311 from being too low. This ensures the density and strength of the manufactured ceramic straight pipe fittings and guarantees the quality of the output products.

[0040] like Figure 2 As shown, the corresponding part after the second threaded part 421 is grouted is the connection part between the ceramic bent pipe and the ceramic straight pipe. It is the main stress-bearing part when the ceramic bent pipe is connected. By inputting ceramic slurry into the cavity wall of the second threaded part 421 corresponding to the location of the second threaded part 421, the density and stress strength of the obtained part corresponding to the internal thread hole of the ceramic bent pipe can be ensured, thereby ensuring the service life of the ceramic bent pipe.

[0041] Furthermore, the middle part of the grouting channel 11 is also provided with a material head receiving cavity 114; The width and height of the material receiving cavity 114 are both greater than the width and height of the other parts of the grouting channel 11.

[0042] like Figures 1-3 As shown, when the ceramic slurry is first injected into the slurry channel 11, the slurry head entering the slurry channel 11 is prone to rapid temperature drop and hardening due to contact with the mold. If it is fed into the second forming cavity 121 or the front cavity 1312, it will not only be easy to block, but also affect the quality of the produced ceramic bent pipe or ceramic straight pipe. Therefore, it is necessary to use the slurry head receiving cavity 114 to receive the slurry head. In addition, the slurry head receiving cavity 114 also has a buffering effect to release the air in the second forming cavity 121 and the front cavity 1312. It also helps the air in the second forming cavity 121 or the front cavity 1312 to be smoothly discharged from the slurry head receiving cavity 114 when the ceramic slurry enters the second forming cavity 121 or the front cavity 1312, thereby ensuring the integrity of the ceramic bent pipe or ceramic straight pipe and avoiding the formation of sand holes due to the presence of air bubbles in the product.

[0043] Furthermore, the ceramic core mold also has two locking holes 101; The two locking holes 101 pass through the two diagonally opposite corners of the upper template 1 and the two diagonally opposite corners of the lower template 2 from top to bottom; the locking holes 101 are provided with internal threads.

[0044] like Figures 1-2 As shown, the upper template 1 and the lower template 2 can be locked together using a screw through the locking hole 101.

[0045] Furthermore, the ceramic core mold also has two mold opening notches 102; The two mold opening notches 102 are located at two diagonal corners of the upper template 1 and are recessed upwards at the two corners of the upper template 1.

[0046] like Figure 2 As shown, when opening or closing the mold, the upper mold plate 1 can be taken out through the two mold opening notches 102, which can prevent fingers from being pinched and improve the convenience and safety of operation.

[0047] In summary, such as Figures 1-3 The embodiment of the present invention shown uses the ceramic core mold of the ceramic pipe fitting to complete the forming of the ceramic straight pipe fitting and the ceramic bent pipe fitting in one grouting process. The two pipe fittings can be screwed together, which can eliminate the need for post-processing of the two threaded parts. It not only meets the assembly requirements of the ceramic pipe of the bent argon arc welding gun, but also has good grouting forming efficiency.

[0048] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of the invention without inventive effort, and these embodiments will all fall within the scope of protection of the present invention.

Claims

1. A ceramic core mold for ceramic pipe fittings, used for forming ceramic pipe fittings for bending-type argon arc welding torches, characterized in that, Includes upper template, lower template, first core-pulling assembly, and second core-pulling assembly; The ceramic core mold is provided with a slurry injection channel, a first cylindrical channel and a second cylindrical channel for injecting ceramic slurry; the upper mold plate is provided with a first mold closing plane and the lower mold plate is provided with a second mold closing plane; the first mold closing plane and the second mold closing plane abut against each other and form a mold closing surface; the slurry injection channel, the first cylindrical channel and the second cylindrical channel are respectively symmetrically divided into two halves with the mold closing surface as the plane of symmetry. The upper parts of the grouting channel, the first cylindrical channel, and the second cylindrical channel are respectively formed on the first mold closing plane, and the lower parts of the grouting channel, the first cylindrical channel, and the second cylindrical channel are respectively formed on the second mold closing plane. The first core-pulling assembly includes a first core-pulling rod of straight rod shape, and the second core-pulling assembly includes a second core-pulling rod of straight rod shape and a third core-pulling rod of semi-circular shape; The first cylindrical channel has a cylindrical first forming cavity in the middle, and the cavity wall at the front end of the first forming cavity has a first threaded portion; the front half of the first core-pulling rod is located in the first forming cavity; the rear end of the first core-pulling rod extends backward and is exposed outside the ceramic core mold. The front end of the second core-pulling rod is detachably connected to one end of the third core-pulling rod; the outer circumferential surface of the front end of the second core-pulling rod is provided with a second threaded portion; the middle part of the second cylindrical channel is provided with a curved cylindrical second forming cavity, and the second threaded portion and part of the curved section of the third core-pulling rod are located in the second forming cavity; the other end of the third core-pulling rod and the rear end of the second core-pulling rod extend and protrude from the ceramic core mold respectively; The second threaded portion is screwed into and matched with the first threaded portion; the cavity wall of the first molding cavity and the cavity wall of the second molding cavity are respectively connected to the slurry output end of the grouting channel; The first core-pulling rod includes a thicker part and a thinner part; The outer peripheral surface of the front end of the thick part is provided with a third threaded part; the rear end of the thin part is embedded in or connected to the front end of the thick part; the axis of the thick part and the axis of the thin part are the same straight line, and the diameter of the thick part is larger than the diameter of the thin part; The rear half of the thick portion extends rearward and is exposed outside the ceramic core mold; The first molding cavity is divided into a rear cavity and a front cavity; the front half of the thick body is located in the rear cavity, and the thin body is located in the front cavity.

2. The ceramic core mold for ceramic pipe fittings according to claim 1, characterized in that, It also includes an insert; the insert is provided with a through hole, and the inner wall surface of the through hole is provided with the first threaded portion; The insert is divided into two mirror-symmetrical halves, and the through hole extends from front to back through the center of the insert. The upper template and the lower template are each provided with two recessed insert grooves; the two insert grooves are symmetrically distributed vertically with respect to the mold closing surface, and the insert grooves are located at the front end of the front cavity; the two insert grooves are respectively used to receive the two halves of the insert; The front end of the larval part passes through the front cavity and the through hole sequentially from back to front, and the gap between the threaded inner wall of the through hole and the front end inner wall of the front cavity is connected to the front cavity.

3. The ceramic core mold for ceramic pipe fittings according to claim 2, characterized in that, The first core-pulling assembly also includes a first external connector; the first cylindrical channel is further provided with a thicker part fixing cavity and a thinner part fixing cavity; The thick body fixing cavity extends from the rear end face of the ceramic core mold and connects to the rear end of the rear cavity; The rear half of the thick part passes through the fixing cavity of the thick part and is connected to the first external connector. The front end face of the first external connector abuts against the rear end face of the ceramic core mold. The rear end of the larval body fixing cavity is connected to the through hole; the front end of the larval body extends into the larval body fixing cavity through the through hole, and the groove wall of the larval body fixing cavity abuts against the outer peripheral surface of the larval body.

4. The ceramic core mold for ceramic pipe fittings according to claim 1, characterized in that, The second core-pulling assembly also includes a second external connector and a third external connector; The ceramic core mold is also provided with a ring-shaped core-pulling cavity, which is divided into upper and lower halves and recessed inward on the right end face of the upper template and the right end face of the lower template, respectively; the ring-shaped core-pulling cavity is provided with a connector placement groove. The second cylindrical channel is also provided with a second core-pulling rod fixing cavity in the form of a cylinder and a third core-pulling rod fixing cavity in the form of a curved cylinder; The second core-pulling rod fixing cavity extends from the rear end face of the ceramic core mold and communicates with the second molding cavity. The rear end of the second core-pulling rod extends along the second core-pulling rod fixing cavity and connects with the front end face of the second external connector. The front end face of the second external connector abuts against the rear end face of the ceramic core mold. The annulus containing the axis of the third core-pulling rod fixing cavity, the annulus containing the axis of the second forming cavity, and the annulus containing the axis of the third core-pulling rod of the semi-circular cylinder are all the same circle. The third core-pulling rod fixing cavity extends along the circle to the front cavity wall of the core-pulling cavity of the annulus component. The other end of the third core-pulling rod extends along the fixing cavity of the third core-pulling rod and is connected to the front end face of the third external connector. The front end face of the third external connector abuts against the front cavity wall of the core-pulling cavity of the annular component. The connector placement groove is recessed inward in the middle of the left cavity wall of the annular core-pulling cavity. The connector placement groove is used to place the third external connector connected to the third core-pulling rod. The distance between the axis of the connector placement groove and the vertex of the left inner corner of the annular core-pulling cavity, and the distance between the center point of the annular core-pulling rod fixing cavity located on the front cavity wall of the annular core-pulling cavity and the vertex of the left inner corner of the annular core-pulling cavity are all equal to the radius of the circle.

5. The ceramic core mold for ceramic pipe fittings according to claim 1, characterized in that, The grouting channel is provided with an injection port, a first grout outlet, and a second grout outlet; The grouting channel is distributed between the second molding cavity and the front cavity; The injection port is located on the rear end face of the ceramic core mold; The tail end of the grouting channel extends forward in a horizontal direction to the middle of the front cavity, and then connects to the middle cavity wall of the front cavity and the cavity wall of the corresponding second threaded part of the second forming cavity through the first grout outlet and the second grout outlet, respectively.

6. The ceramic core mold for ceramic pipe fittings according to claim 5, characterized in that, The middle part of the grouting channel is also provided with a material head receiving cavity; The width and height of the material receiving cavity are both greater than the width and height of the other parts of the grouting channel.

7. The ceramic core mold for ceramic pipe fittings according to claim 1, characterized in that, The ceramic core mold also has two locking holes; The two locking holes pass through the two diagonally opposite corners of the upper template and the two diagonally opposite corners of the lower template from top to bottom; the locking holes are provided with internal threads.

8. The ceramic core mold for ceramic pipe fittings according to claim 1, characterized in that, The ceramic core mold also has two mold opening notches; The two mold opening notches are located at two diagonal corners of the upper template and are recessed upwards at the two corners of the upper template.

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