Forming method of screw valve stator

Abstract

The forming method is based on a forming mold, the forming mold comprises an upper mold plate and a lower mold plate capable of moving up and down relative to the upper mold plate, a mold base is installed on the lower surface of the upper mold plate, and end covers are installed at the two ends of a cylindrical barrel installed in the mold base respectively. The two end covers are arranged on the cylindrical barrel, so that a glue injection cavity is formed between the two end covers and the cylindrical barrel, at least one glue inlet communicated with the glue injection cavity is formed in the outer surface of the cylindrical barrel, and a glue storage groove communicated with the glue inlet through a pipeline is formed in the lower surface of the mold base. The production cost can be saved, the appearance precision of the screw valve stator obtained through forming and the matching degree of the screw valve stator and a screw valve rotor in the follow-up using process can be improved, the situation that forming holes and different parts of a product are poor in consistency can be avoided, demolding operation is facilitated, damage to the formed product in the demolding process is avoided, and the production efficiency is improved. The processing quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of screw valve processing, and in particular to a molding method for a screw valve stator. Background Art

[0002] A positive displacement pump is a pump that uses the change in volume inside the pump cylinder to transport liquids. It relies on the working element to make reciprocating or rotary motion in the pump cylinder to alternately increase and decrease the working volume to achieve the suction and discharge of liquids. It includes piston pumps, plunger pumps, gear pumps, diaphragm pumps, screw pumps and other types. Among them, a screw pump is a positive displacement pump that relies on the change in the volume of the pump chamber when the screw rotates to suck in and transport water. Screw pumps include single screw, twin screw and multi-screw types. When the screw pump is used in the field of dispensing, the high precision requirement for dispensing glue leads to greatly improved requirements for the conveying accuracy of the screw pump. The matching degree between the stator and the rotor in the screw pump directly determines the conveying accuracy of the screw pump. Therefore, how to obtain a stator with high dimensional accuracy and high matching degree with the rotor has become an urgent problem to be solved. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a molding method for a screw valve stator. The molding method for a screw valve stator can improve the shape accuracy of the screw valve stator obtained by molding and the matching degree with the screw valve rotor during subsequent use, and also facilitate the demolding operation and avoid damage to the molded product during the demolding process, thereby improving the processing quality.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a molding method for a screw valve stator, based on a molding mold, the molding mold comprises: an upper mold plate and a lower mold plate that can move up and down relative to the upper mold plate, a mold base is installed on the lower surface of the upper mold plate, and an end cap is installed at both ends of a cylindrical barrel installed in the mold base, so that a glue injection cavity is formed between the two end caps and the cylindrical barrel, at least one glue inlet connected to the glue injection cavity is opened on the outer surface of the cylindrical barrel, a glue storage tank connected to the glue inlet through a pipeline is opened on the lower surface of the mold base, and the upper end of a glue supply push rod installed on the upper surface of the lower mold plate is embedded in the glue storage tank and slidably cooperates with the inner wall of the glue storage tank, and the two end caps each have a mounting hole on the center of the surface facing the glue injection cavity; The molding method comprises the following steps: Step 1: first install the screw valve rotor corresponding to the screw valve stator into the cylindrical barrel, then install the end covers to the two ends of the cylindrical barrel respectively, and embed the connecting parts at the two ends of the screw valve rotor into the mounting holes on the end covers accordingly, so that a molding cavity for molding the screw valve stator is formed between the spiral main body part axially arranged in the cylindrical barrel and the inner wall of the injection cavity; Step 2: Install a cylindrical barrel with a screw valve rotor built in and end covers installed at both ends in the mold base, and make the glue inlet on the cylindrical barrel correspondingly connected to the pipeline connected to the glue storage tank on the mold base; Step 3: driving the lower template to move toward the upper template to close the mold, so that the plastic liquid stored in the glue storage tank in a molten state enters the molding cavity from the glue inlet on the cylindrical barrel under the push of the glue supply push rod until the molding cavity is filled; Step 4: Wait for a while to allow the plastic liquid in the molding cavity to cool and form; Step 5: Take out the cylindrical barrel with the screw valve rotor built in and end covers installed at both ends from the mold base; Step 6: Remove the end caps at both ends of the cylindrical barrel, and then drive at least one screw valve rotor on the screw valve rotor to rotate out from the formed screw valve stator; Step 7: De-mould and remove the formed screw valve stator from the cylindrical barrel.

[0005] The further improved scheme in the above technical scheme is as follows: 1. In the above scheme, the mold base further includes: an upper base plate fixedly mounted on the upper mold plate and a lower base plate mounted on the lower surface of the upper base plate, and an arc-shaped mounting groove for the cylindrical barrel to be embedded is respectively formed on the lower surface of the upper base plate and the upper surface of the lower base plate.

[0006] 2. In the above solution, the glue storage tank is opened on the lower surface of the lower substrate.

[0007] 3. In the above scheme, each of the two end covers is provided with a positioning plate on the side opposite to the injection cavity, and the positioning plate connected to the end face of one end of the mold base is provided with a mounting groove on the surface facing the end cover, and the end cover is formed with a mounting protrusion on the side facing the positioning plate to cooperate with the mounting groove.

[0008] 4. In the above solution, a plane is formed on the inner wall of the mounting groove into which the mounting protrusion can be embedded.

[0009] 5. In the above scheme, a strip hole is opened in the center of the bottom surface of the installation groove, and the connecting parts at both ends of the screw valve rotor correspondingly pass through the installation hole on the end cover and are embedded in the strip hole and contact and cooperate with the inner wall of the strip hole.

[0010] 6. In the above solution, the glue inlet is opened at the axial center of the cylindrical barrel.

[0011] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The molding method of the screw valve stator of the present invention can not only save production costs, but also improve the shape accuracy of the screw valve stator obtained by molding and the matching degree with the screw valve rotor during subsequent use, and can also avoid molding holes and poor consistency of different parts of the product, and also facilitate demolding operations and avoid damage to the molded product during the demolding process, thereby improving processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Attached Figure 1 It is a schematic diagram of the overall structure of the molding method of the screw valve stator of the present invention; Attached Figure 2 It is a schematic diagram of the overall structure disassembly of the screw valve stator of the present invention; Attached Figure 3 It is a schematic diagram of the partial structure of the screw valve stator of the present invention; Attached Figure 4 It is a schematic diagram of the partial structure disassembly of the screw valve stator of the present invention; Attached Figure 5 For attachment Figure 4 A schematic cross-sectional structure diagram of ; Attached Figure 6 It is a schematic diagram of the molding cavity of the screw valve stator of the present invention.

[0013] In the above drawings: 101, screw valve stator; 102, spiral main body; 103, connecting part; 1, cylindrical barrel; 2, end cover; 201, annular connecting part; 202, annular connecting part; 3, glue injection cavity; 4, glue inlet; 5, mounting hole; 6, molding cavity; 7, positioning plate; 81, mounting groove; 82, mounting protrusion; 83, strip hole; 9, annular groove; 10, annular cavity; 11, upper template; 12, lower template; 13, mold base; 131, upper base plate; 132, lower base plate; 133, arc-shaped placement groove; 134, arc-shaped avoidance groove; 141, pipeline; 142, glue storage tank; 15, glue supply push rod; 151, second flange; 16, fixing plate; 161, mounting through hole; 162, first flange. Implementation

[0014] The present invention can be further understood through the specific embodiments given below, but they are not intended to limit the present invention.

[0015] Embodiment 1: A molding method for a screw valve stator is based on a molding mold, the molding mold comprising: an upper mold plate 11 and a lower mold plate 12 that can move up and down relative to the upper mold plate 11, a mold base 13 is installed on the lower surface of the upper mold plate 11, and an end cover 2 is installed at both ends of a cylindrical barrel 1 installed in the mold base 13, so that a glue injection cavity 3 is formed between the two end covers 2 and the cylindrical barrel 1, at least one glue inlet 4 connected to the glue injection cavity 3 is opened on the outer surface of the cylindrical barrel 1, a glue storage tank 142 connected to the glue inlet 4 through a pipeline 141 is opened on the lower surface of the mold base 13, and an upper end of a glue supply push rod 15 installed on the upper surface of the lower mold plate 12 is embedded in the glue storage tank 142 and slidably cooperates with the inner wall of the glue storage tank 142, and the two end covers 2 each have a mounting hole 5 on the center of the surface facing the glue injection cavity 3; The molding method comprises the following steps: Step 1: first install the screw valve rotor corresponding to the screw valve stator 101 into the cylindrical barrel 1, then install the end caps 2 to the two ends of the cylindrical barrel 1 respectively, and insert the connecting parts 103 at the two ends of the screw valve rotor into the mounting holes 5 on the end caps 2 accordingly, so that a molding cavity 6 for molding the screw valve stator 101 is formed between the spiral main body 102 axially arranged in the cylindrical barrel 1 and the inner wall of the injection cavity 3; Step 2: Install the cylindrical barrel 1 with a screw valve rotor and end caps 2 installed at both ends into the mold base 13 and make the glue inlet 4 on the cylindrical barrel 1 communicate with the pipeline 141 connected to the glue storage tank 142 on the mold base 13 correspondingly; Step 3: driving the lower mold plate 12 to move toward the upper mold plate 11 to close the mold, so that the molten plastic liquid stored in the glue storage tank 142 enters the molding cavity 6 from the glue inlet 4 on the cylindrical barrel 1 under the push of the glue supply push rod 15 until the molding cavity 6 is filled; Step 4: Wait for a while to allow the plastic liquid in the molding cavity 6 to cool and form; Step 5: Take out the cylindrical barrel 1 with the screw valve rotor built in and the end covers 2 installed at both ends from the mold base 13; Step 6: Remove the end caps 2 at both ends of the cylindrical barrel 1, and then drive at least one screw valve rotor on the screw valve rotor to rotate out from the formed screw valve stator 101; Step 7: De-mould the formed screw valve stator 101 from the cylindrical barrel 1.

[0016] The mold base 13 further includes an upper base plate 131 fixedly mounted on the upper mold plate 11 and a lower base plate 132 mounted on the lower surface of the upper base plate 131 . The lower surface of the upper base plate 131 and the upper surface of the lower base plate 132 are respectively provided with an arc-shaped receiving groove 133 for the cylindrical barrel 1 to be embedded.

[0017] Both ends of each arc-shaped groove 133 are provided with an arc-shaped avoidance groove 134 that cooperates with the end cover 2 .

[0018] The glue storage tank 142 is disposed on the lower surface of the lower substrate 132 .

[0019] A fixing plate 16 is installed on the upper surface of the lower template 12, and the lower end of the glue supply push rod 15 is embedded in a mounting hole 161 opened on the fixing plate 16, and a first flange portion 162 is formed radially inward on the upper part of the inner wall of the mounting hole 161, and a second flange portion 151 is formed radially outward on the outer surface of the lower end of the glue supply push rod 15, and the lower surface of the first flange portion 162 is press-fitted with the upper surface of the second flange portion 151.

[0020] The two end covers 2 are each provided with a positioning plate 7 on the side opposite to the injection cavity 3. The positioning plate 7 connected to one end face of the mold base 13 is provided with a mounting groove 81 on the surface facing the end cover 2. The end cover 2 is formed with a mounting protrusion 82 on the side facing the positioning plate 7 to cooperate with the mounting groove 81.

[0021] A plane is formed on the inner wall of the installation groove 81 into which the installation protrusion 82 can be inserted.

[0022] Embodiment 2: A molding method for a screw valve stator is based on a molding mold, the molding mold comprising: an upper mold plate 11 and a lower mold plate 12 that can move up and down relative to the upper mold plate 11, a mold base 13 is installed on the lower surface of the upper mold plate 11, and an end cover 2 is installed at both ends of a cylindrical barrel 1 installed in the mold base 13, so that a glue injection cavity 3 is formed between the two end covers 2 and the cylindrical barrel 1, at least one glue inlet 4 connected to the glue injection cavity 3 is opened on the outer surface of the cylindrical barrel 1, a glue storage tank 142 connected to the glue inlet 4 through a pipeline 141 is opened on the lower surface of the mold base 13, and an upper end of a glue supply push rod 15 installed on the upper surface of the lower mold plate 12 is embedded in the glue storage tank 142 and slidably cooperates with the inner wall of the glue storage tank 142, and the two end covers 2 each have a mounting hole 5 on the center of the surface facing the glue injection cavity 3; The molding method comprises the following steps: Step 1: first install the screw valve rotor corresponding to the screw valve stator 101 into the cylindrical barrel 1, then install the end caps 2 to the two ends of the cylindrical barrel 1 respectively, and insert the connecting parts 103 at the two ends of the screw valve rotor into the mounting holes 5 on the end caps 2 accordingly, so that a molding cavity 6 for molding the screw valve stator 101 is formed between the spiral main body 102 axially arranged in the cylindrical barrel 1 and the inner wall of the injection cavity 3; Step 2: Install the cylindrical barrel 1 with a screw valve rotor and end caps 2 installed at both ends into the mold base 13 and make the glue inlet 4 on the cylindrical barrel 1 communicate with the pipeline 141 connected to the glue storage tank 142 on the mold base 13 correspondingly; Step 3: driving the lower mold plate 12 to move toward the upper mold plate 11 to close the mold, so that the molten plastic liquid stored in the glue storage tank 142 enters the molding cavity 6 from the glue inlet 4 on the cylindrical barrel 1 under the push of the glue supply push rod 15 until the molding cavity 6 is filled; Step 4: Wait for a while to allow the plastic liquid in the molding cavity 6 to cool and form; Step 5: Take out the cylindrical barrel 1 with the screw valve rotor built in and the end covers 2 installed at both ends from the mold base 13; Step 6: Remove the end caps 2 at both ends of the cylindrical barrel 1, and then drive at least one screw valve rotor on the screw valve rotor to rotate out from the formed screw valve stator 101; Step 7: De-mould the formed screw valve stator 101 from the cylindrical barrel 1.

[0023] The mold base 13 further includes an upper base plate 131 fixedly mounted on the upper mold plate 11 and a lower base plate 132 mounted on the lower surface of the upper base plate 131 . The lower surface of the upper base plate 131 and the upper surface of the lower base plate 132 are respectively provided with an arc-shaped receiving groove 133 for the cylindrical barrel 1 to be embedded.

[0024] The two end covers 2 are each provided with a positioning plate 7 on the side opposite to the injection cavity 3. The positioning plate 7 connected to one end face of the mold base 13 is provided with a mounting groove 81 on the surface facing the end cover 2. The end cover 2 is formed with a mounting protrusion 82 on the side facing the positioning plate 7 to cooperate with the mounting groove 81.

[0025] A strip hole 83 is provided at the center of the bottom surface of the mounting groove 81 , and the connecting parts 103 at both ends of the screw valve rotor correspondingly passing through the mounting hole 5 on the end cover 2 are embedded in the strip hole 83 and contact and cooperate with the inner wall of the strip hole 83 .

[0026] An annular groove 9 extending along the entire circumference is provided on the outer circumferential surface of both ends of the cylindrical body 1. The annular connecting portion 201 of the end cover 2 is sleeved on the cylindrical body 1, and the inner wall of the annular connecting portion 201 is in contact with the bottom surface of the annular groove 9.

[0027] An annular cavity 10 communicating with the glue injection cavity 3 is formed between the end surface of the annular connecting portion 201 on the end cover 2 and the side wall of the annular groove 9 .

[0028] The glue inlet 4 is located at the axial center of the cylindrical body 1 .

[0029] The above-mentioned method for forming a screw valve stator can not only save production costs, but also improve the shape accuracy of the screw valve stator obtained by forming and the matching degree with the screw valve rotor during subsequent use. It can also avoid forming holes and poor consistency of different parts of the product, facilitate demoulding operations and avoid damage to the molded product during the demoulding process, thereby improving processing quality.

[0030] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for forming a screw valve stator, based on a forming mold, the forming mold comprising: An upper template (11) and a lower template (12) movable up and down relative to the upper template (11), characterized in that: a mold base (13) is installed on the lower surface of the upper template (11), an end cover (2) is installed at each end of a cylindrical barrel (1) installed in the mold base (13), so that a glue injection cavity (3) is formed between the two end covers (2) and the cylindrical barrel (1), at least one glue inlet (4) connected to the glue injection cavity (3) is provided on the outer surface of the cylindrical barrel (1), a glue storage tank (142) connected to the glue inlet (4) through a pipeline (141) is provided on the lower surface of the mold base (13), an upper end of a glue supply push rod (15) installed on the upper surface of the lower template (12) is embedded in the glue storage tank (142) and slidably cooperates with the inner wall of the glue storage tank (142), and a mounting hole (5) is provided at the center of each surface of the two end covers (2) facing the glue injection cavity (3); The molding method comprises the following steps: Step 1: first install a screw valve rotor corresponding to the screw valve stator (101) into the cylindrical barrel (1), then install the end covers (2) to the two ends of the cylindrical barrel (1), and respectively embed the connecting parts (103) at the two ends of the screw valve rotor into the mounting holes (5) on the end covers (2) accordingly, so that a molding cavity (6) for molding the screw valve stator (101) is formed between the spiral main body (102) axially arranged in the cylindrical barrel (1) and the inner wall of the injection cavity (3); Step 2: Install a cylindrical barrel (1) having a screw valve rotor built therein and end covers (2) mounted at both ends in a mold base (13) so that the glue inlet (4) on the cylindrical barrel (1) is correspondingly connected to a pipeline (141) on the mold base (13) connected to a glue storage tank (142); Step 3: driving the lower template (12) to move in the direction of the upper template (11) to close the mold, so that the plastic liquid stored in the glue storage tank (142) in a molten state enters the molding cavity (6) from the glue inlet (4) on the cylindrical barrel (1) under the push of the glue supply push rod (15) until the molding cavity (6) is filled; Step 4: Wait for a period of time to allow the plastic liquid in the molding cavity (6) to cool and form; Step 5: Take out the cylindrical barrel (1) with the screw valve rotor built in and end covers (2) installed at both ends from the mold base (13); Step 6: Remove the end covers (2) at both ends of the cylindrical barrel (1), and then drive at least one screw valve rotor on the screw valve rotor to rotate out from the formed screw valve stator (101); Step 7: De-mould the formed screw valve stator (101) from the cylindrical barrel (1).

2. The method for forming a screw valve stator according to claim 1, characterized in that: The mold base (13) further comprises: an upper base plate (131) fixedly mounted on the upper mold plate (11) and a lower base plate (132) mounted on the lower surface of the upper base plate (131), wherein the lower surface of the upper base plate (131) and the upper surface of the lower base plate (132) are respectively provided with an arc-shaped receiving groove (133) for the cylindrical barrel (1) to be embedded.

3. The method for forming a screw valve stator according to claim 2, characterized in that: The glue storage groove (142) is opened on the lower surface of the lower base plate (132).

4. The method for forming a screw valve stator according to claim 1, characterized in that: A positioning plate (7) is provided on each of the two end covers (2) on a side opposite to the injection cavity (3); a mounting groove (81) is provided on a surface of the positioning plate (7) connected to an end face of the mold base (13) facing the end cover (2); and a mounting protrusion (82) is formed on a side of the end cover (2) facing the positioning plate (7) and matching with the mounting groove (81).

5. The method for forming a screw valve stator according to claim 4, characterized in that: A plane is formed on the inner wall of the mounting groove (81) into which the mounting protrusion (82) can be embedded.

6. The method for forming a screw valve stator according to claim 4, characterized in that: A strip hole (83) is provided in the center of the bottom surface of the mounting groove (81), and the connecting parts (103) at both ends of the screw valve rotor correspondingly pass through the mounting hole (5) on the end cover (2) and are embedded in the strip hole (83) and contact and cooperate with the inner wall of the strip hole (83).

7. The method for forming a screw valve stator according to claim 1, characterized in that: The glue inlet (4) is opened at the axial center of the cylindrical barrel (1).

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