A screw valve stator forming die and a forming process

Abstract

The present application relates to a kind of screw valve stator forming die and forming process, forming die includes: stator forming base, stator forming upper cover, stator mold core, stator tube shell, glue cavity injection glue rod, the stator forming base and stator forming upper cover are closed to form glue cavity injection, the stator mold core, stator tube shell coaxial setting in glue cavity injection, guarantee the stator mold core in the forming screw and stator tube shell concentric arrangement, glue cavity injection is blocked by stator mold core and glue rod from two sides, make screw valve forming cavity between the forming screw and stator tube shell, the forming process using above-mentioned forming die, rubber fluid is passed into in screw valve forming cavity, after rubber fluid is treated by vulcanization process, just can be vulcanized in screw valve forming cavity and form the inner lining rubber of stable inner dimension in stator tube shell.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of screw valve stator preparation, in particular to a screw valve stator forming die and forming process. BACKGROUND

[0002] With the improvement of the degree of automation in the dispensing field, the demand for dispensing precision is gradually increasing, and the contradiction between dispensing efficiency and dispensing precision is also prominent. In the traditional dispensing valve mechanism, the glue in the glue barrel is pumped out by the piston rod and piston movement in the dispensing valve, and then coated on the target product. However, when the dispensing amount is required to be small, the dispensing precision is low and the dispensing defective rate is high by using this dispensing method, ultimately leading to high product cost. Therefore, in the existing high-precision dispensing valve mechanism, a screw pump is used, which utilizes the cooperation of the screw valve stator and the screw valve rotor to realize the volume change of the sealed cavity to control the amount of liquid suction and discharge.

[0003] In the screw pump, the screw valve stator is an important component that affects the dispensing valve precision and service life. Currently, the processing method of the screw valve stator is to cast rubber in the stator tube shell to form. However, the screw valve stator prepared by the traditional casting process has poor forming size stability. In the working state of the screw pump, the inner lining rubber of the screw valve stator expands and swells unevenly, resulting in uneven interference between the stator and the rotor, unbalanced stress on the screw valve stator, and thus easier failure of the screw valve stator. Therefore, in order to normally use the screw valve stator in the screw pump, it is necessary to prepare a screw valve stator with stable size. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is to overcome the uneven wall thickness of the inner lining rubber when the screw valve stator is prepared by the casting method in the prior art, and to provide a screw valve stator forming die and forming process, which uses a model injection molding method to prepare a screw valve stator with stable size.

[0005] To solve the above technical problems, the present application provides a screw valve stator forming die, comprising:

[0006] A stator forming base and a stator forming upper cover are provided, and a semicircular accommodation groove penetrating along the length direction of the stator forming base and the stator forming upper cover is formed in each of the stator forming base and the stator forming upper cover. After the stator forming base and the stator forming upper cover are closed, the two accommodation grooves are spliced to form a glue injection cavity.

[0007] A stator mold core is arranged in the glue injection cavity. The stator mold core has a head and a forming screw. The head and the forming screw are coaxially arranged. The head is in clearance fit with the glue injection cavity, and the head blocks the glue injection cavity on one side.

[0008] A stator tube shell is arranged in the glue injection cavity, the stator tube shell is a hollow sleeve, the stator tube shell is in clearance fit with the glue injection cavity, the stator tube shell is sleeved on the outer periphery of the forming screw rod, and a screw valve forming cavity is formed between the stator tube shell and the forming screw rod;

[0009] A glue injection cavity pressing rod is in cooperation with the stator tube shell, presses glue forming in the screw valve forming cavity, and is in cooperation with the end head to block the other side of the glue injection cavity.

[0010] In an embodiment of the present application, a positioning block is arranged on the end head of the stator mold core, and the positioning block protrudes from the glue injection cavity after the end head blocks the glue injection cavity.

[0011] In an embodiment of the present application, a positioning plate is further arranged, the positioning plate is connected with the stator forming base, and a positioning hole is arranged on the positioning plate and matched with the positioning block.

[0012] In an embodiment of the present application, the end of the glue injection cavity pressing rod protrudes from the glue injection cavity.

[0013] In an embodiment of the present application, a plurality of semicircular accommodation grooves are arranged in the stator forming base and the stator forming upper cover, and a plurality of glue injection cavities are formed after the stator forming base and the stator forming upper cover are closed.

[0014] In an embodiment of the present application, a handle is arranged on the stator forming upper cover.

[0015] To solve the above technical problems, the present application further provides a screw valve stator forming process, comprising the following steps:

[0016] S1, the stator mold core is placed in the semicircular accommodation groove, and the stator mold core is positioned, so that the forming screw rod of the stator mold core is coaxially arranged with the semicircular accommodation groove in the stator base;

[0017] S2, the stator tube shell is placed in the semicircular accommodation groove, so that the stator tube shell is concentrically sleeved on the outer periphery of the forming screw rod of the stator mold core, and a screw valve forming cavity is formed between the stator tube shell and the forming screw rod;

[0018] S3, the stator forming upper cover is buckled on the stator forming base, so that the accommodation grooves arranged in the stator forming upper cover and the stator forming base are closed and matched to form a glue injection cavity;

[0019] S4, a certain amount of rubber fluid is injected into the screw valve forming cavity along the glue injection cavity;

[0020] S5, after injecting, the rubber fluid is extruded into the screw valve forming cavity by the glue injection cavity pressing rod, the glue injection cavity is blocked, vulcanization forming treatment is started, and the rubber fluid is vulcanized and formed in the screw valve forming cavity.

[0021] In one embodiment of the present application, the injected rubber fluid is weighed according to the outer diameter size of the stator mold core, the density of the used rubber fluid, and the volume size of the screw valve forming cavity.

[0022] In one embodiment of the present application, different types of rubber fluid are injected according to the properties of the preformed screw valve.

[0023] In one embodiment of the present application, the step S6, after the rubber fluid is vulcanized and formed, the stator mold core and the glue injection cavity pressing rod are pulled out from the glue injection cavity, the glue injection formed screw valve stator is spirally taken out from the stator mold core, different models of stator mold cores are put into the glue injection cavity, and different models of screw valve stators are prepared by repeating steps S4 and S5.

[0024] The above technical scheme of the present application has the following advantages compared with the prior art:

[0025] The screw valve stator forming mold and forming process of the present application set the stator forming base and the stator forming upper cover to cooperate to form the glue injection cavity, the stator mold core and the stator tube shell are respectively placed into the glue injection cavity, the relative positions of the stator mold core and the stator tube shell are limited by the stator forming base and the stator forming upper cover, the stator mold core and the stator tube shell are coaxially arranged with the glue injection cavity, and the gap is matched, the forming screw of the stator mold core can be inserted into the position of the center of the stator tube shell, the screw valve forming cavity is formed between the forming screw and the stator tube shell, the rubber fluid is introduced into the screw valve forming cavity, and the rubber fluid can be vulcanized to form the inner lining rubber with stable size in the stator tube shell after the vulcanization process.

[0026] The screw valve stator forming mold and forming process of the present application set the through semi-circular accommodation grooves in the stator forming base and the stator forming upper cover to form the through glue injection cavity, the stator mold core and the glue injection cavity pressing rod are respectively blocked on both sides of the glue injection cavity, after the rubber fluid is vulcanized and formed, the stator mold core and the glue injection cavity pressing rod are directly pulled out from both sides of the glue injection cavity without completely opening the stator forming base and the stator forming upper cover, and the glue injection formed screw valve stator can be taken out from the forming mold, when different models of screw valve stators are needed to be prepared, only different models of stator mold cores and stator tube shells need to be inserted into the glue injection cavity, and the mold needs not to be frequently opened and closed.

[0027] And, the glue injection cavity of the present application is through arrangement, and it is not necessary to open the injection flow channel communicated with the screw valve forming cavity in the stator forming base or the stator forming upper cover, the rubber fluid is directly injected into the screw valve forming cavity from the opening of the glue injection cavity, so that the rubber fluid does not pass through the injection flow channel, the amount of the rubber fluid can be accurately controlled, and the waste of the rubber fluid is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to make the content of the present application more easily understood, the present application will be further described in detail below according to specific embodiments of the present application and in conjunction with the drawings, in which:

[0029] Figure 1 is a structure diagram of the stator forming mold of the screw valve of the present application;

[0030] Figure 2 is a step flow chart of the stator forming method of the screw valve of the present application.

[0031] The description of the drawing signs of the present application is as follows: 1, stator forming base; 2, stator forming upper cover; 3, stator mold core; 4, glue injection cavity glue pressing rod; 5, positioning plate; 6, handle. DETAILED DESCRIPTION

[0032] The present application will be further described below in conjunction with the drawings and specific embodiments, so that the person skilled in the art can better understand the present application and implement it, but the embodiments are not as a limitation on the present application.

[0033] Example 1

[0034] Referring to Figure 1 The present application discloses a kind of stator forming mold of screw valve, including: stator forming base 1, stator forming upper cover 2, stator mold core 3, stator tube shell, glue injection cavity glue pressing rod 4, wherein:

[0035] The stator forming base 1 and stator forming upper cover 2 can be matched, and a semicircular accommodating groove is formed on the corresponding mold closing surface of the stator forming base 1 and the stator forming upper cover 2, which penetrates along the length direction of the stator forming base 1 and the stator forming upper cover 2, after the stator forming base 1 and the stator forming upper cover 2 are closed, the two accommodating grooves are spliced to form a through glue injection cavity;

[0036] The stator mold core 3, the stator tube shell and the glue injection cavity pressing rod 4 are arranged in the glue injection cavity, the stator mold core 3 has a head and a forming screw rod, the head and the forming screw rod are coaxially arranged, the head and the forming screw rod are integrally formed, the diameter of the head is the same as the diameter of the glue injection cavity, the head is in clearance fit with the glue injection cavity, the head blocks the glue injection cavity on one side, so that the forming screw rod can be arranged at the center position of the glue injection cavity; the stator tube shell is a hollow sleeve, the outer diameter of the stator tube shell is the same as the diameter of the glue injection cavity, the stator tube shell is also in clearance fit with the glue injection cavity, the stator tube shell is sleeved on the outer periphery of the forming screw rod, since the forming screw rod is arranged at the center position of the glue injection cavity, the forming screw rod is also arranged at the center position of the stator tube shell, and a screw rod valve forming cavity is formed between the stator tube shell and the forming screw rod; the glue injection cavity pressing rod 4 is matched with the head to block the other side of the glue injection cavity.

[0037] Specifically, the screw rod valve stator forming mold is used, the relative positions of the stator mold core 3 and the stator tube shell are limited by the stator forming base 1 and the stator forming upper cover 2, the stator mold core 3 and the stator tube shell are coaxially arranged with the glue injection cavity and in clearance fit, the forming screw rod of the stator mold core 3 can be inserted into the center position of the stator tube shell, and the size-stable inner rubber of the screw rod valve stator after glue injection forming can be ensured.

[0038] Moreover, the forming mold of the embodiment is different from the existing glue injection forming mold, the mold base and the mold upper cover of the existing glue injection forming mold can form a closed mold cavity after the mold base and the mold upper cover are closed, the injection flow channel is arranged in the mold base or the mold upper cover, the forming material is injected into the mold cavity through the injection flow channel, and the forming part can be taken out from the mold cavity after the mold base and the mold upper cover are opened after glue injection forming.

[0039] In the embodiment, the through semi-circular accommodation groove is arranged in the stator forming base 1 and the stator forming upper cover 2, thereby forming the through glue injection cavity, the stator mold core 3 and the glue injection cavity pressing rod 4 are used to block the two sides of the glue injection cavity respectively, when the rubber fluid vulcanization forming is completed once, the stator forming base 1 and the stator forming upper cover 2 are not completely opened, the stator mold core 3 and the glue injection cavity pressing rod 4 are directly taken out from the two sides of the glue injection cavity, and the screw rod valve stator after glue injection forming can be taken out from the forming mold, when different models of screw rod valve stators need to be prepared, the stator mold core 3 and the stator tube shell of different models are only needed to be inserted into the glue injection cavity, and the mold is not needed to be frequently opened and closed.

[0040] The injection cavity in the embodiment is throughly arranged, and it is not necessary to open an injection flow channel in communication with the screw valve forming cavity in the stator forming base 1 or the stator forming upper cover 2. Rubber fluid is directly injected into the screw valve forming cavity from the opening of the injection cavity, so that the rubber fluid does not pass through the injection flow channel, the amount of the rubber fluid can be accurately controlled, and waste of the rubber fluid is avoided.

[0041] Specifically, the stator tube shell and the forming screw cooperate to form the screw valve forming cavity. The above structure can limit the concentric arrangement of the forming screw and the stator tube shell, but cannot limit the relative angle of the rotation of the forming screw relative to the stator tube shell. When the screw valve stators of the same batch are prepared by using multiple forming molds, if the angles of the different forming screws in different forming molds relative to the stator tube shell are different, the angles of the inner cavities of the inner linings of the screw valve stators of the same batch are not completely the same. If the stator tube shell also needs to be positioned during use, the different angles of the inner cavities will affect the normal use of the screw valve stators.

[0042] To solve the above problem, in the embodiment, a positioning block is arranged at the end of the stator mold core 3. After the end of the stator mold core 3 blocks the injection cavity, the positioning block protrudes from the injection cavity. By limiting the angle of the positioning block, the angle of the stator mold core 3 placed in the injection cavity can be limited.

[0043] Specifically, in the embodiment, a positioning plate 5 is arranged. The positioning plate 5 is connected with the stator forming base 1. A positioning hole matched with the positioning block is arranged on the positioning plate 5. During assembly and use, the positioning block protruding from the injection cavity is inserted into the positioning hole of the positioning plate 5. Through the unique position matching relationship between the positioning block and the positioning hole, the angle of the stator mold core 3 placed in the injection cavity can be limited.

[0044] In addition, in the embodiment, the positioning block protrudes from the injection cavity. After the injection is completed, the positioning block becomes a handle of the stator mold core 3. By clamping the positioning block, the stator mold core 3 can be conveniently taken out of the injection cavity. Similarly, the end of the glue pressing rod 4 of the injection cavity also protrudes from the injection cavity.

[0045] In the embodiment, a plurality of semicircular accommodation grooves are arranged in the stator forming base 1 and the stator forming upper cover 2. After the stator forming base 1 and the stator forming upper cover 2 are closed, a plurality of injection cavities are formed. The same type of stator mold core 3 and stator tube shell can be placed in the plurality of injection cavities to prepare the screw valve stators of the same batch. Different types of stator mold core 3 and stator tube shell can also be placed in the plurality of injection cavities to prepare the screw valve stators of different batches.

[0046] Specifically, after the stator core 3, the stator tube shell and the injection cavity pressing rod 4 are placed in the injection cavity, the stator forming base 1 and the stator forming upper cover 2 are locked and fixed by bolts, so that the stator forming base 1 and the stator forming upper cover 2 can clamp and fix the stator core 3, the stator tube shell and the injection cavity pressing rod 4, and prevent the stator core 3, the stator tube shell and the injection cavity pressing rod 4 from rotating or sliding in the injection cavity;

[0047] Moreover, handles 6 are arranged on the stator forming base 1 and the stator forming upper cover 2, and when the stator forming base 1 and the stator forming upper cover 2 need to be opened after the injection is completed, the handles 6 can be pulled to realize the opening action of the stator forming base 1 and the stator forming upper cover 2.

[0048] Embodiment 2

[0049] Referring to Figure 2 Based on the above embodiment 1, the present application also discloses a screw valve stator forming process using the forming mold disclosed in embodiment 1, which comprises the following steps:

[0050] S1, the stator core 3 is placed in the semicircular accommodating groove, the forming screw of the stator core 3 is positioned by the end of the stator core 3 cooperating with the semicircular accommodating groove, the coaxial arrangement of the forming screw of the stator core 3 and the semicircular accommodating groove in the stator base is realized, and the relative angle of the forming screw in the stator core 3 is fixed by the positioning block of the stator core 3 cooperating with the positioning hole in the positioning plate 5;

[0051] S2, the stator tube shell is placed in the semicircular accommodating groove, the stator tube is positioned by the stator tube shell cooperating with the semicircular accommodating groove, the stator tube shell is concentrically sleeved outside the periphery of the forming screw of the stator core 3, and the screw valve forming cavity is formed between the stator tube shell and the forming screw;

[0052] S3, the stator forming upper cover 2 is buckled on the stator forming base 1, the semicircular accommodating grooves respectively arranged in the stator forming upper cover 2 and the stator forming base 1 are closed to form an injection cavity, the stator core 3 and the stator tube shell are arranged in the injection cavity, and the injection cavity is communicated with the screw valve forming cavity;

[0053] S4, a certain amount of rubber fluid is injected into the screw valve forming cavity along the injection cavity;

[0054] S5, after the injection, the rubber fluid is extruded into the screw valve forming cavity by the injection cavity pressing rod, the injection cavity is blocked, the stator forming base 1 and the stator forming upper cover 2 are fixed and locked by bolts, the vulcanization forming process is started, and the rubber fluid is vulcanized and formed in the screw valve forming cavity.

[0055] Specifically, in the embodiment, the weight of the injected rubber fluid is quantified according to the outer diameter size of the stator mold core, the density of the rubber fluid used, and the volume size of the screw valve forming cavity, so as to accurately control the injection amount of the rubber fluid and avoid waste of the rubber fluid;

[0056] In addition, different types of rubber fluid are injected according to the properties of the preformed screw valve, so as to prepare different types of rubber liners, such as heat-resistant melt type rubber liners, corrosion-resistant rubber liners, wear-resistant rubber liners, and the like.

[0057] Specifically, in the embodiment, the step S6 is further included, that is, after the rubber fluid is vulcanized and formed, if the forming mold is no longer needed, the stator forming base 1 and the stator forming upper cover 2 are opened and processed, the stator mold core 3 and the injection molding cavity rubber pressing rod 4 are extracted, and the injection molded screw valve stator is sleeved on the forming screw of the stator mold core 3. Only relative rotation of the screw valve stator and the stator mold core 3 can realize separation of the screw valve stator and the stator mold core 3, and the mold is cleaned after opening.

[0058] After the rubber fluid is vulcanized and formed, if the forming mold is still needed, the bolts fixedly locked between the stator forming base 1 and the stator forming upper cover 2 are loosened, the stator mold core 3 and the injection molding cavity rubber pressing rod 4 are extracted from the injection molding cavity, and then different models of stator mold cores 3 are placed in the injection molding cavity. The steps S4 and S5 are repeated to prepare different models of screw valve stators until all the preparation is completed, and the mold is opened and cleaned after the last preparation is completed.

[0059] Obviously, the above embodiment is only an example for clear illustration, and is not a limitation on the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments need not and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A screw valve stator forming mold, characterized in that, include: The stator forming base and the stator forming top cover are provided with semi-circular accommodating grooves that extend along the length of the stator forming base and the stator forming top cover. After the stator forming base and the stator forming top cover are molded together, the two accommodating grooves are joined together to form a through injection cavity. A stator mold core is disposed in the injection cavity. The stator mold core has an end and a forming screw. The end and the forming screw are coaxially arranged. The end is clearance-fitted with the injection cavity. The end blocks the injection cavity on one side. A positioning block is provided at the end of the stator mold core. After the end blocks the injection cavity, the positioning block protrudes from the injection cavity. The mold core also includes a positioning plate. The positioning plate is connected to the stator forming base. The positioning plate has positioning holes that mate with the positioning block. A stator tube housing is disposed in the injection cavity. The stator tube housing is a hollow sleeve. The stator tube housing is clearance-fitted with the injection cavity. The stator tube housing is sleeved on the outer periphery of the forming screw. A screw valve forming cavity is formed between the stator tube housing and the forming screw. The glue injection cavity pressure rod cooperates with the stator tube shell to press glue into the forming cavity of the screw valve, and cooperates with the end to seal the other side of the glue injection cavity.

2. The screw valve stator forming mold according to claim 1, characterized in that: The end of the glue injection cavity pressure rod protrudes from the glue injection cavity.

3. The screw valve stator forming mold according to claim 1, characterized in that: The stator forming base and the stator forming top cover are provided with multiple semi-circular placement grooves. After the stator forming base and the stator forming top cover are molded together, multiple injection cavities are formed.

4. The screw valve stator forming mold according to claim 1, characterized in that: The stator forming cover is provided with a handle.

5. A screw valve stator forming process, implemented using the screw valve stator forming mold according to any one of claims 1 to 4, characterized in that, Includes the following steps: S1. Place the stator mold core in the semi-circular positioning groove and position it so that the forming screw of the stator mold core is coaxial with the semi-circular positioning groove in the stator base. S2. Place the stator tube outer shell in the semi-circular groove so that the stator tube outer shell is concentrically fitted around the outer circumference of the forming screw of the stator mold core, forming a screw valve forming cavity between the stator tube outer shell and the forming screw. S3. Fasten the stator forming cover onto the stator forming base, so that the receiving grooves located in the stator forming cover and the stator forming base respectively fit together to form the injection cavity; S4. Inject a fixed amount of rubber fluid into the molding cavity of the screw valve along the injection cavity; S5. After injection, the rubber fluid is squeezed into the screw valve molding cavity by the injection cavity pressure rod, and the injection cavity is sealed to start the vulcanization molding process, so that the rubber fluid is vulcanized in the screw valve molding cavity.

6. The screw valve stator forming process according to claim 5, characterized in that: The injected rubber fluid is weighed and quantified according to the outer diameter of the stator mold core, the density of the rubber fluid used, and the volume of the screw valve molding cavity.

7. The screw valve stator forming process according to claim 5, characterized in that: Different types of rubber fluid are injected depending on the properties of the pre-formed screw valve.

8. The screw valve stator forming process according to claim 5, characterized in that: The process also includes step S6, after the rubber fluid is vulcanized and molded, the stator core and the injection mold cavity pressure rod are pulled out from the injection cavity, the injection molded screw valve stator is screwed off from the stator core, different models of stator cores are placed in the injection cavity, and steps S4 and S5 are repeated to prepare different models of screw valve stators.

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