Pole type sensor pressure injection process

Abstract

The invention relates to a pressure injection process for a pole type sensor. The pressure injection process comprises the following steps: performing pressure injection on a resin body; coating a coupling agent on the surface, needing to be coated with the silicone rubber, of the resin body; pressing and injecting solid silicon rubber outside the resin body: fixing the resin body in a silica gel mold, pressing and injecting the solid silicon rubber into an inner cavity of the silica gel mold by using a pressing and injecting machine, enabling the solid silicon rubber to enter the space between the resin body and the inner cavity wall of the silica gel mold from one side of the umbrella skirt of the resin body in a multi-point manner, exhausting air from the other side of the umbrella skirt of the resin body, and after the rubber feeding is completed, pressing and injecting the solid silicon rubber into the inner cavity of the silica gel mold; and keeping a certain temperature in the silica gel mold for a certain time for preliminary vulcanization to form a silicone rubber injection-compression body, opening the mold, taking out the silicone rubber injection-compression body, and baking the silicone rubber injection-compression body until the silicone rubber is completely vulcanized, thereby completing the injection-compression of the pole type sensor. Solid silicone rubber can be adopted in the pressure injection process, the forming effect of the whole pole type sensor is better, the service life is longer, and the cost is lower.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding of pole type sensors, in particular to an injection molding process of pole type sensors. Background Art

[0002] The existing pole-type sensor is used for 10kV pole-mounted switches, which are operated in outdoor environments and are exposed to direct sunlight. The injection shell of the existing pole-type sensor is a combination of epoxy resin and silicone rubber from the inside to the outside. The silicone rubber is located in the outermost layer to resist direct sunlight and prevent the epoxy resin from cracking and powdering due to long-term exposure to the sun, resulting in a short service life. The injection material of the existing pole-type sensor generally uses liquid silicone rubber, which has the problems of high price, low tear strength, and easy dust absorption. If solid silicone rubber is used, the above problems can be avoided, but in the solid silicone rubber injection process, the injection pressure is higher and the injection pressure is easy to concentrate, resulting in excessive pressure at a certain position of the inner shell, which will cause damage to the epoxy resin. Summary of the invention

[0003] The present invention provides a pole-type sensor injection molding process, which enables the entire pole-type sensor to have a better molding effect and a longer service life.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A polar column type sensor injection molding process, using a resin mold for injection molding epoxy resin and a silicone mold for injection molding silicone rubber, comprising:

[0006] Injection resin body: fix the parts of the pole-type sensor in the resin mold, use an injection machine to fill the inner cavity of the resin mold with epoxy resin, keep the resin mold at a certain temperature for a certain time to initially solidify the epoxy resin to form a resin body blank, open the mold, bake the resin body blank until it is completely solidified to form a resin body, and cool it to room temperature;

[0007] Apply coupling agent on the surface of the resin body that needs to be coated with silicone rubber;

[0008] Solid silicone rubber is injected outside the resin body: the resin body is fixed in the silicone mold, and the solid silicone rubber is injected into the inner cavity of the silicone mold using an injection machine. The silicone rubber enters between the resin body and the inner cavity wall of the silicone mold from multiple points on one side of the resin body shed, and is exhausted from the other side of the resin body shed. After the injection is completed, the silicone rubber is initially vulcanized at a certain temperature in the silicone mold for a certain time to form a silicone rubber injection body. The mold is opened, the silicone rubber injection body is taken out, and it is baked until the silicone rubber is completely vulcanized. The injection of the pole type sensor is completed.

[0009] Preferably, the glass transition temperature of the epoxy resin is greater than the vulcanization temperature of the silicone rubber.

[0010] Preferably, after the inner cavity of the resin mold is filled with epoxy resin, the steps of preliminary curing and thorough curing of the resin body are as follows:

[0011] Keep the resin mold at 115° C. for 40 minutes to 1 hour to initially cure the epoxy resin to form a resin body blank;

[0012] The mold is opened, the resin body blank is taken out, and the resin body is placed in an oven at a temperature of 90° C. for 12 hours to completely cure the epoxy resin to form a resin body.

[0013] Preferably, after the inner cavity of the silicone mold is filled with silicone rubber, the steps of preliminary vulcanization and complete vulcanization of the silicone rubber are as follows:

[0014] The silicone mold is kept at 95°C for 40 minutes to 1 hour to initially vulcanize the silicone rubber to form a silicone rubber injection molding;

[0015] Open the mold, take out the silicone rubber injection molding, put the silicone rubber injection molding into an oven at a temperature of 70°C and bake it for 12 hours to completely vulcanize the silicone rubber, then cool it to room temperature, and the injection molding of the pole type sensor is completed.

[0016] Preferably, the method further comprises the steps of: preheating the solid silicone rubber to a certain temperature, reducing its viscosity, and then injecting the solid silicone rubber into the silicone mold.

[0017] Preferably, the method further comprises the following steps: after the silicone rubber fills the inner cavity of the silicone mold, the silicone mold is quickly opened once to release the gas in the mold cavity, and then preliminary vulcanization is performed.

[0018] Preferably, after the resin body is placed in the silicone mold, there is a uniform gap of 3 mm between the resin body and the inner cavity of the silicone mold.

[0019] Preferably, the silicone mold comprises an upper mold, a middle frame and a lower mold, the upper mold is fixed to the injection end of the injection molding machine, and the steps of fixing the resin body in the silicone mold include:

[0020] First, the upper, middle and bottom parts of the resin body are sealed and fixed on the middle frame, and the two are integrated;

[0021] The resin body fixed on the middle frame is placed flat on the clamping position of the lower mold, and the upper mold fixed on the injection molding machine is pressed down and pressed tightly against the lower mold to complete the silicone mold closing.

[0022] Preferably, the silicone mold includes an upper mold, a middle frame and a lower mold, wherein the upper mold is fixed to the injection end of the injection molding machine by screws, the middle frame includes a rectangular outer frame, a middle support cylinder, an upper support cylinder, a bottom support column and a support block, the bottom support column is a T-shaped structure, the rectangular outer frame is detachable, and is connected by four support rods by screws, and the steps of fixing the resin body on the middle frame include:

[0023] The middle support tube and the upper support tube are respectively threadedly connected to the screw rod extending from the middle part and the screw rod extending from the upper part of the resin body, and an O-type sealing ring is sleeved between the middle support tube and the middle end surface of the resin body, and an O-type sealing ring is sleeved between the upper support tube and the upper side wall of the resin body;

[0024] The small end of the bottom support column is passed through the support block, and the support block is abutted against the large end of the bottom support column and the two are connected, and then the large end of the bottom support column is placed into the mounting hole at the bottom of the resin body, and the support block is abutted against the bottom end surface of the resin body, and an O-ring is provided between the two, which is sleeved on the outer peripheral side of the bottom support column;

[0025] Then, four support rods are connected to the screw end face extending from the middle of the resin body, the screw end face extending from the upper part of the resin body and the small end of the bottom support column by screws, and the four support rods are connected to form a rectangular outer frame.

[0026] Preferably, the upper mold in the silicone mold is provided with a glue injection port, and the mating surfaces of the upper mold and the lower mold form a plurality of glue inlet channels and exhaust channels, one end of the glue inlet channel is connected to the glue injection port, and the other end flows to the resin body shed, and the glue inlet channel and the exhaust channel are respectively located on both sides of the resin body shed.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The pole-type sensor uses solid silicone rubber as the outermost coating layer, which can effectively resist the damage of ultraviolet rays to the internal epoxy resin, thereby ensuring the service life of the entire pole-type sensor epoxy resin shell.

[0029] 2. The glue injection technical solution is to inject glue from multiple points on the resin body shed, and the glue injection points are evenly distributed on the resin body shed. The resin body shed is an arc surface with a large dispersion surface, which can effectively disperse the glue injection pressure, so that the resin body is evenly stressed, avoiding uneven stress on the resin body, and preventing a part of it from cracking due to concentrated stress. In addition, the glue injection technical solution adopted in this embodiment also includes injecting glue on one side of the shed and exhausting on the other side of the shed, which can effectively discharge the air, so that the molding effect of the entire pole type sensor is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a block diagram of the injection molding process in an embodiment of the present invention;

[0032] Figure 2 This is an overall schematic diagram of the silicone mold of the device in the embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the silicone mold portion of the device in an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of a middle frame fixing resin body in an embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of fixing the middle frame, the resin body and the lower mold in an embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram of the connection between the bottom support column and the support block in an embodiment of the present invention;

[0037] Figure 7 Schematic diagram of a resin body according to an embodiment of the present invention.

[0038] Description of reference numerals:

[0039] 1. Upper mold; 11. Glue injection port; 2. Middle frame; 21. Rectangular outer frame; 22. Upper support cylinder; 23. Middle support cylinder; 24. Bottom support column; 25. Support block; 3. Lower mold; 4. Glue inlet channel; 5. Exhaust channel; 6. Resin body. DETAILED DESCRIPTION

[0040] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] like Figure 1-7 As shown, an embodiment of the present invention provides a polar column type sensor injection molding process, which is implemented by a resin mold, a silicone mold and an injection molding machine, wherein the injection molding machine and the resin mold cooperate to inject epoxy resin to initially form a resin body, and then the injection molding machine and the silicone mold cooperate to inject a silicone rubber outer layer outside the resin body, thereby implementing the injection molding of the polar column type sensor, and the specific steps are as follows:

[0044] Injection resin body: fix the parts of the pole-type sensor at the corresponding positions in the resin mold, and then use the injection machine to inject epoxy resin into the inner cavity of the resin mold through the injection port of the resin mold. After the material is filled, inject silicone rubber into the resin mold at a certain temperature for a certain time, so that the epoxy resin is initially cured into a resin body blank, and then open the mold, put the resin body blank into an oven and bake it at a certain temperature for a certain time, so that the resin body blank is completely cured to form a resin body, and then take it out and cool it to room temperature to complete the injection of the resin body. The various parts include the parts that the pole-type sensor should have, such as the capacitor voltage divider, the current coil, and the vacuum interrupter; the resin mold uses a mold for injection resin body.

[0045] Then, a coupling agent is applied to the surface of the resin body where the solid silicone rubber is to be coated. The coupling agent is a silane coupling agent, which can enhance the bonding strength between the composite materials and enhance the resistance to humidity and other adverse environmental conditions.

[0046] Solid silicone rubber is injected outside the resin body: first, the resin body is fixed in the silicone mold, and then the solid silicone rubber is injected into the silicone mold by an injection machine. The silicone rubber enters between the resin body and the inner wall of the silicone mold from multiple points on one side of the resin body umbrella skirt in the silicone mold. After the silicone rubber fills the inner cavity of the silicone mold, the silicone mold is kept at a certain temperature for a certain time to make the silicone rubber initially vulcanized to form a silicone rubber injection body. Then the mold is opened, the silicone rubber injection body is taken out, and the silicone rubber injection body is placed in an oven and baked at a certain temperature for a certain time to completely vulcanize the silicone rubber. The silicone rubber injection is completed, and the injection of the entire pole type sensor is completed.

[0047] During the injection process of the above-mentioned pole-type sensor, the solid silicone rubber is injected. The glue injection technology scheme adopted in this embodiment is to inject glue from multiple points of the resin body shed, and the injection points are evenly distributed on the resin body shed. The resin body shed is an arc surface with a large dispersion surface, which can effectively disperse the injection pressure, so that the resin body is evenly stressed, avoiding uneven stress on the resin body, and a certain part of it is cracked due to concentrated stress; and the glue injection technology scheme adopted in this embodiment also includes multiple glue injection points located on one side of the resin body shed. The purpose of one side is to avoid a small amount of air remaining after the injection is completed, resulting in a shortage of materials. The glue is injected on one side of the shed and exhausted on the other side of the shed, which can effectively discharge the air. In addition, the pole-type sensor uses silicone rubber as the outermost coating layer, which can effectively resist the damage of ultraviolet rays to the internal epoxy resin, thereby ensuring the service life of the epoxy resin shell of the entire pole-type sensor.

[0048] The glass transition temperature of the epoxy resin used above is greater than the vulcanization temperature of the silicone rubber. The vulcanization temperature here refers to the temperature at which the silicone rubber is rapidly vulcanized. In this embodiment, the glass transition temperature of the epoxy resin is greater than that of the rubber by more than 110°C, specifically 115°C, and the vulcanization temperature of the silicone rubber is 90°C. The temperature difference is used to ensure that the vulcanization temperature during the injection molding process of the solid silicone rubber will not cause the resin body to vitrify, thereby avoiding damage to the resin body.

[0049] Specifically, after the inner cavity of the resin mold is filled with epoxy resin, the specific steps for the initial curing and thorough curing of the resin body are as follows: maintain the temperature of the resin mold at 115°C for 40 minutes to 1 hour to allow the epoxy resin to be initially cured to form a resin body blank, then open the mold, take out the resin body blank from the resin mold, and bake the resin body blank in an oven at a temperature of 90°C for 12 hours to allow the epoxy resin to be thoroughly cured, and then cool to room temperature to finally form a resin body to ensure the integrity of the shape of the resin body.

[0050] Specifically, the specific steps of silicone rubber injection are as follows: before injecting solid silicone rubber through the injection machine, the solid silicone rubber needs to be preheated to a certain temperature, specifically 40℃-50℃, which can reduce the viscosity of the silicone rubber and make it easier to inject it into the silicone mold. After the silicone rubber fills the silicone mold cavity from the resin body umbrella skirt, the silicone mold maintains a temperature of 95℃ for 40 minutes to 1 hour to allow the silicone rubber to be initially vulcanized to form a silicone rubber injection body, then open the mold, take out the silicone rubber injection body from the silicone mold, and place the silicone rubber injection body in an oven at 70℃ for 12 hours to completely vulcanize the silicone rubber, then cool to room temperature, the silicone rubber injection is completed, and the entire pole-type sensor injection is completed.

[0051] Preferably, after the silicone rubber fills the inner cavity of the silicone mold, the silicone mold needs to be quickly opened up and down once, and then initially vulcanized, so that the water vapor generated in the cavity can be discharged before vulcanization to avoid material shortages and bubbles. The silicone mold can be closed again to reshape the silicone rubber between the silicone mold and the resin body to avoid material shortages and ensure the integrity of the silicone rubber injection shape outside the resin body.

[0052] Specifically, the heating and heat preservation of the resin mold and the silicone mold can be achieved by electric heating, and the cooling can be achieved by a cold water circulation machine.

[0053] Specifically, in this embodiment, after the resin body is placed in the silicone mold, there is a uniform gap of 3 mm between the resin body and the inner cavity of the silicone mold, so that the thickness of the silicone rubber wall formed is 3 mm.

[0054] Specifically, the resin mold adopts an existing mold for injecting epoxy resin, such as Figure 2-7 As shown, the silicone mold comprises an upper mold 1, a middle frame 2 and a lower mold 3, wherein the upper mold 1 is fixed to the injection end of the injection molding machine by screws, the middle frame 2 comprises a rectangular outer frame 21, a middle support cylinder 23, an upper support cylinder 22, a bottom support column 24 and a support block 25, the bottom support column 24 is a T-shaped structure, the rectangular outer frame 21 is detachable, and is connected by four support rods by screws, and the resin body 6 is fixed on the middle frame 2. The steps include:

[0055] The middle support tube 23 and the upper support tube 22 are respectively threadedly connected to the screw extending from the middle part and the screw extending from the upper part of the resin body 6, and an O-type sealing ring is sleeved between the middle support tube 23 and the middle end surface of the resin body 6, and an O-type sealing ring is sleeved between the upper support tube 22 and the upper side wall of the resin body 6;

[0056] The small end of the bottom support column 24 is passed through the support block 25, and the support block 25 is abutted against the large end of the bottom support column 24 and the two are connected. Then the large end of the bottom support column 24 is placed into the mounting hole at the bottom of the resin body 6, and the support block 25 is abutted against the bottom end surface of the resin body 6, and an O-ring is provided between the two, which is sleeved on the outer peripheral side of the bottom support column 24;

[0057] Then, four support rods are connected to the corresponding screw rod end faces extending from the middle of the resin body 6 , the screw rod end faces extending from the upper part of the resin body 6 and the small end of the bottom support column 24 by screws, and the four support rods are connected by screws to form a rectangular outer frame 21 .

[0058] In addition, the screw end face extending from the middle of the resin body 6, the screw end face extending from the upper part of the resin body 6, and the small end of the bottom support column 24 are located in the installation groove provided on the side wall of the support block 25, so that the installation of the resin body 6 is more secure.

[0059] The silicone mold is provided with a middle frame 2 outside the upper mold 1 and the lower mold 3, so that the middle frame 2 fixes the resin body 6 to form a whole, so that the resin body 6 has a large supporting force to resist the injection pressure during the injection of silicone rubber, so that the resin body 6 is more stable during the injection of silicone rubber; and O-rings are provided at the connection between the upper, middle and lower parts of the resin body 6 and the rectangular outer frame 21 to prevent the silicone rubber from entering the inner cavity of the resin body 6 during the injection process.

[0060] Specifically, the upper mold 1 has an injection port 11 on the upper end surface, and the upper mold 1 and the lower mold 3 both have corresponding clamping positions. After the upper mold 1 and the lower mold 3 are molded together, the upper and lower clamping positions form a glue injection cavity, and the resin body 6 is installed in the glue injection cavity. The rectangular outer frame 21 is located on the outer peripheral side of the upper mold 1 and the lower mold 3.

[0061] After the upper mold 1 and the lower mold 3 are closed, three through holes are formed for the small ends of the upper support tube 22, the middle support tube 23 and the bottom support column 24 to be placed, and the sizes are matched so that the resin body 6 can be suspended in the injection cavity, so that there is a 3mm gap between the outer wall of the resin body 6 and the wall of the injection cavity.

[0062] Specifically, the upper mold 1 in the silicone mold is provided with a glue injection port 11, and the upper mold 1 has a glue injection flow channel connected to the glue injection port 11. After the upper mold 1 and the lower mold 3 are molded together, a plurality of glue inlet channels 4 and a plurality of exhaust channels 5 are formed at the mold surfaces of the upper mold 1 and the lower mold 3. The exhaust channels 5 are connected to the outside. Specifically, the exhaust channels 5 also have the function of blocking the outflow of silicone rubber. As a prior art, it is not repeated here. One end of the glue inlet channel 4 is connected to the glue injection flow channel, and the other end flows to the resin body 6 umbrella skirt. The glue inlet channel 4 and the exhaust channel 5 are respectively located on both sides of the resin body 6 umbrella skirt.

[0063] In this embodiment, if Figure 4-5 As shown, the middle frame 2 can fix two resin bodies 6 at a time, the middle parts of the resin bodies 6 are respectively fixed on two opposite support rods, the upper and lower parts of the resin bodies 6 are respectively installed on two opposite support rods, and the four support rods form the middle frame 2. The corresponding upper mold 1 and lower mold 3 form two injection cavities after the mold is closed, and the two resin bodies 6 are placed respectively. The injection port 11 and the injection flow channel are located between the two injection cavities, and the injection channel 4 is located in the middle. There are two groups, and the two groups of injection channels 4 correspond to the two injection cavities respectively. The silicone rubber enters the two groups of injection channels 4 from the injection port 11 through the injection flow channel, and flows to both sides and flows into the corresponding injection cavity to complete the injection.

[0064] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A pole type sensor injection molding process, characterized in that: include: Injection resin body: fix the parts of the pole-type sensor in the resin mold, use an injection machine to fill the inner cavity of the resin mold with epoxy resin, keep it at a certain temperature in the resin mold for a certain time, so that the epoxy resin is initially solidified to form a resin body blank, open the mold, bake the resin body blank until it is completely solidified to form a resin body, and cool it to room temperature; Apply coupling agent on the surface of the resin body that needs to be coated with silicone rubber; Inject solid silicone rubber outside the resin body: fix the resin body in the silicone mold, use an injection machine to inject solid silicone rubber into the inner cavity of the silicone mold, and the silicone rubber enters between the resin body and the inner cavity wall of the silicone mold from multiple points on one side of the resin body shed, and exhausts from the other side of the resin body shed. After the injection is completed, keep a certain temperature in the silicone mold for a certain time to make the silicone rubber initially vulcanized to form a silicone rubber injection body, open the mold, take out the silicone rubber injection body, and bake it until the silicone rubber is completely vulcanized. The injection of the pole type sensor is completed.

2. The injection molding process of the pole type sensor according to claim 1, characterized in that: The glass transition temperature of epoxy resin is greater than the vulcanization temperature of silicone rubber.

3. The injection molding process of the pole type sensor according to claim 2, characterized in that: After the inner cavity of the resin mold is filled with epoxy resin, the initial curing and complete curing steps of the resin body are as follows: Keep the resin mold at 115° C. for 40 minutes to 1 hour to initially cure the epoxy resin to form a resin body blank; The mold is opened, the resin body blank is taken out, and the resin body is placed in an oven at a temperature of 90° C. for 12 hours to completely cure the epoxy resin to form a resin body.

4. The injection molding process of the pole type sensor according to claim 3 is characterized in that: After the inner cavity of the silicone mold is filled with silicone rubber, the initial vulcanization and complete vulcanization steps of the silicone rubber are as follows: The silicone mold is kept at 95°C for 40 minutes to 1 hour to initially vulcanize the silicone rubber to form a silicone rubber injection molding; Open the mold, take out the silicone rubber injection molding, put the silicone rubber injection molding into an oven at a temperature of 70°C and bake it for 12 hours to completely vulcanize the silicone rubber, then cool it to room temperature, and the injection molding of the pole type sensor is completed.

5. The injection molding process of the pole type sensor according to claim 1, characterized in that: The method also includes the steps of preheating the solid silicone rubber to a certain temperature, reducing its viscosity, and then injecting the solid silicone rubber into the silicone mold.

6. The injection molding process of the pole type sensor according to claim 1, characterized in that: The method also includes the following steps: after the silicone rubber fills the inner cavity of the silicone mold, the silicone mold is quickly opened once, and then preliminary vulcanization is performed.

7. The injection molding process of the pole type sensor according to claim 1, characterized in that: After the resin body is placed in the silicone mold, there is a uniform gap of 3 mm between the resin body and the inner cavity of the silicone mold.

8. The injection molding process of the pole type sensor according to claims 1-7, characterized in that: The silicone mold includes an upper mold, a middle frame and a lower mold. The upper mold is fixed to the injection end of the injection molding machine. The steps of fixing the resin body in the silicone mold include: First, the upper, middle and bottom parts of the resin body are sealed and fixed on the middle frame, and the two are integrated; The resin body fixed on the middle frame is placed flat on the clamping position of the lower mold, and the upper mold fixed on the injection molding machine is pressed down and pressed tightly against the lower mold to complete the silicone mold closing.

9. The injection molding process of the pole type sensor according to claim 8, characterized in that: The silicone mold includes an upper mold, a middle frame and a lower mold, wherein the upper mold is fixed to the injection end of the injection molding machine by screws, the middle frame includes a rectangular outer frame, an upper support cylinder, a middle support cylinder, a bottom support column and a support block, the bottom support column is a T-shaped structure, the rectangular outer frame is detachable, and is connected by four support rods by screws. The steps of fixing the resin body on the middle frame include: The middle support tube and the upper support tube are respectively threadedly connected to the screw rod extending from the middle part and the screw rod extending from the upper part of the resin body, and an O-type sealing ring is sleeved between the middle support tube and the middle end surface of the resin body, and an O-type sealing ring is sleeved between the upper support tube and the upper side wall of the resin body; The small end of the bottom support column is passed through the support block, and the support block is abutted against the large end of the bottom support column and the two are connected, and then the large end of the bottom support column is placed into the mounting hole at the bottom of the resin body, and the support block is abutted against the bottom end surface of the resin body, and an O-ring is provided between the two, which is sleeved on the outer peripheral side of the bottom support column; Then, four support rods are connected to the screw end face extending from the middle of the resin body, the screw end face extending from the upper part of the resin body and the small end of the bottom support column by screws, and the four support rods are connected to form a rectangular outer frame.

10. The injection molding process of the pole type sensor according to claim 8, characterized in that: The upper mold in the silicone mold is provided with a glue injection port, and the mating surfaces of the upper mold and the lower mold form multiple glue inlet channels and exhaust channels. One end of the glue inlet channel is connected to the glue injection port, and the other end flows to the resin body umbrella skirt, and the glue inlet channel and the exhaust channel are respectively located on both sides of the resin body umbrella skirt.

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