Pouring mold and pouring method of integrated sensor

Abstract

The invention belongs to the technical field of equipment special for assembling mutual inductors, and particularly provides a pouring mold and a pouring method of an integrated sensor. The pouring method comprises the steps that annular and flexible positioning blocking objects are installed on a guide rod, then the guide rod is sleeved with a combination comprising a shielding net and an insulation pipe, the positioning blocking objects are at least located at the two ends of the insulation pipe so as to support the insulation pipe and seal a gap between the insulation pipe and the guide rod, then the guide rod is connected with a static mold, and the static mold is sealed. And other parts of the integrated sensor are sequentially installed and then are poured, and after pouring is completed, the guide rod and the insulating tube are separated. The pouring mold is used for realizing the pouring method. The positioning plugging object plays a role in positioning, supporting and sealing, it is guaranteed that the insulating tube and the guide rod are not prone to moving in the pouring process, then the coaxiality of the coil and the insulating tube is guaranteed, meanwhile, epoxy resin is prevented from entering the position between the guide rod and the insulating tube, and demolding is convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of equipment specially used for assembling mutual inductors, and in particular relates to a casting mold and a casting method for an integrated sensor. Background Art

[0002] The pole-mounted circuit breaker is an important switchgear in the outdoor power system, which is mainly used to control and protect the circuits in the distribution network. The pole-mounted circuit breaker will be equipped with a voltage transformer and a current transformer. In order to facilitate the installation of the equipment, the invention patent application with the application publication number CN114720746A discloses an integrated sensor that integrates voltage measurement and current measurement. The integrated sensor integrates a coil and a capacitor inside, wherein the coil is sleeved outside the insulating tube (i.e., the epoxy resin tube), and there is a gap between the insulating tube and the coil. A shielding net is also provided between the insulating tube and the coil. An external contact (i.e., an electrical contact) is connected to one end of the insulating tube. When in use, a conductive rod can be inserted into the inside of the insulating tube, and the external contact is electrically connected to the conductive rod. The coil is connected to the outside with a bracket, and the lead wire of the coil is arranged along the bracket and electrically connected to the preset wiring terminal.

[0003] The patent with the authorization announcement number CN218111443U discloses a mold that can be used to mold the above-mentioned integrated sensor. The mold includes a static mold and a dynamic mold, which can be buckled to form multiple cavities, and each cavity is connected with a runner for epoxy resin to flow in. Before pouring, the coil, insulating tube, shielding net, external contact, etc. need to be assembled to form a coil shielding assembly. In order to prevent the epoxy resin from clogging the inner hole of the insulating tube, the casting mold also includes a guide rod (i.e., a through-hole core), one end of the guide rod can be inserted into the static mold (i.e., the static mold is provided with a guide rod jack for inserting one end of the guide rod), and the other end can be inserted into the insulating tube of the coil shielding assembly (i.e., the insulating tube is sleeved on the guide rod when in use), and the end position of this end can be connected to the dynamic mold. The capacitor of the sensor is assembled later, and a capacitor slot core is also provided on the static mold. After the pouring is completed, the capacitor slot core position can form a capacitor slot for installing the capacitor. The bracket is placed on the capacitor slot core, which can play a role in supporting the coil shielding assembly. After the coil shield assembly, bracket and other inserts are placed in place, the dynamic mold and the static mold are buckled together, and epoxy resin is injected. After the epoxy resin is cured, the sensor body can be initially formed.

[0004] Whether the coil and the insulating tube are coaxial is related to the performance and accuracy of the sensor. The above patent does not disclose the matching relationship between the guide rod and the insulating tube. In fact, generally speaking, setting the guide rod and the insulating tube to an interference fit with a small interference amount can ensure that the insulating tube and the guide tube are coaxial and can ensure that the position of the insulating tube is stable and immobile during the pouring process. However, the interference fit is actually easy to cause cracks in the insulating tube. In addition, the guide rod and the insulating tube are made of different materials, and the thermal expansion during the pouring process is different, especially when the insulating tube is a glass fiber tube, it is more likely to cause damage to the insulating tube. However, if the size of the guide rod is reduced, that is, the guide rod and the insulating tube are set to a clearance fit, it will cause the guide rod and the insulating tube to have an eccentricity, which makes it difficult to ensure that the insulating tube and the guide rod are coaxial, and during the pouring process, the epoxy resin is also easy to enter between the guide rod and the insulating tube, resulting in difficulty in demolding. Summary of the invention

[0005] The purpose of the present invention is to provide a casting mold for an integrated sensor to solve the technical problems in the prior art that when the guide rod and the insulating tube of the casting mold are interference-fitted, cracks in the insulating tube are easily caused, when the guide rod is gap-fitted, the positioning effect of the guide rod is insufficient, and epoxy resin easily enters between the guide rod and the insulating tube, resulting in difficulty in demoulding. The purpose of the present invention is also to provide a casting method for an integrated sensor to solve the same technical problem.

[0006] To achieve the above-mentioned purpose, the technical solution of the casting mold of the integrated sensor provided by the present invention is: A casting mold for an integrated sensor comprises a static mold, a dynamic mold and a guide rod. The guide rod is used to penetrate an insulating tube of the integrated sensor. The diameter of the guide rod is smaller than the inner hole diameter of the insulating tube so that a gap is formed between the guide rod and the insulating tube. The guide rod is provided with at least two positioning sealant mounting grooves for fitting an annular positioning sealant. The positioning sealant mounting grooves at both ends are positioned so that the positioning sealant installed therein does not exceed the two end positions of the insulating tube. The size of the gap satisfies the sealing and supporting cooperation between the positioning sealant and the insulating tube.

[0007] As a further improvement, one end of the guide rod for inserting into the static die is provided with a pulling structure for cooperating with a pulling tool to pull out the guide rod.

[0008] As a further improvement, the drawing structure is a drawing hole for inserting the drawing rod.

[0009] As a further improvement, one end of the guide rod for inserting into the movable mold is provided with a movable mold sealing ring groove for installing a movable mold sealing ring, wherein the movable mold sealing ring is used to seal the connection position between the guide rod and the movable mold.

[0010] As a further improvement, the casting mold also includes a demolding rod, and the static mold is provided with a demolding rod socket for inserting the demolding rod, the demolding rod socket is connected with the guide rod socket on the static mold for inserting the guide rod, the angle formed by the extension direction of the demolding rod socket and the guide rod socket is not less than 90 degrees, and the insertion end of the demolding rod is provided with a push rod surface for pushing one end of the guide rod to remove the guide rod from the static mold.

[0011] As a further improvement, one end of the guide rod for inserting into the movable mold is provided with a chamfered structure for cooperating with the ejector rod surface.

[0012] As a further improvement, the demoulding rod and the demoulding rod insertion hole are anti-rotation and guide matched, and the ejector rod surface is arranged on the side of the demoulding rod facing the guide rod.

[0013] As a further improvement, the demoulding rod is further provided with a stop structure for cooperating with the notch of the demoulding rod insertion hole to limit the insertion depth of the demoulding rod.

[0014] As a further improvement, the stopping structure includes two or more stopping bosses spaced apart on the periphery of the demoulding rod.

[0015] The present invention belongs to an improved invention creation, and has the beneficial effect that: when the casting operation of the integrated sensor is performed, the matching relationship between the static mold, the dynamic mold and the guide rod and the static mold and the dynamic mold is consistent with the prior art. Different from the prior art, in actual production, the positioning plugging object can be installed in the positioning plugging object installation groove set on the guide rod, and the positioning plugging objects at the two end positions do not exceed the two end positions of the insulating tube and are sealed and supported with the insulating tube, so that the following three effects are achieved. First, the positioning plugging object can play a basic sealing role to prevent the epoxy resin from entering the gap between the insulating tube and the guide rod during casting, which is convenient for subsequent demoulding. Second, the positioning plugging object can also play a role in positioning and supporting the insulating tube after being compressed, which can ensure that the insulating tube and the guide rod are coaxial, thereby producing an integrated sensor with higher coaxiality between the coil and the insulating tube. Third, the positioning plugging objects at both ends can also indicate to the staff when the insulating tube is in place. When the positioning plugging object at the end enters the insulating tube, the friction between the insulating tube and the guide rod is the largest, which means that the insulating tube is in place, which can prevent the staff from using too much force to cause the insulating tube to hit the guide rod and cause damage to the insulating tube.

[0016] To achieve the above-mentioned purpose, the technical solution of the casting method of the integrated sensor provided by the present invention is: The casting method of the integrated sensor comprises the following steps: installing an annular, flexible positioning plugging object on the guide rod, and then sleeve a combination including a shielding net and an insulating tube on the guide rod, wherein the positioning plugging object is located at least at both ends of the insulating tube to support the insulating tube and seal the gap between the insulating tube and the guide rod. After that, the guide rod is connected to the static mold, and other components of the integrated sensor are installed in turn and then cast. After the casting is completed, the guide rod and the insulating tube are separated.

[0017] The present invention is a pioneering invention with the following beneficial effects: when the method is used to cast an integrated sensor, the positioning blocker on the guide rod has the following three effects: first, the positioning blocker can play a basic sealing role to prevent epoxy resin from entering the gap between the insulating tube and the guide rod during casting, thereby facilitating subsequent demoulding; second, the positioning blocker can also play a role in positioning and supporting the insulating tube after being compressed, thereby ensuring that the insulating tube and the guide rod are coaxial, thereby producing an integrated sensor with higher coaxiality between the coil and the insulating tube; third, the positioning blockers at both ends can also indicate to the staff when the insulating tube is in place; when the positioning blocker at the end enters the insulating tube, the friction between the insulating tube and the guide rod is the largest, indicating that the insulating tube is in place, thereby preventing the staff from using too much force to cause the insulating tube to hit the guide rod and cause damage to the insulating tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an embodiment of a casting mold of an integrated sensor in the present invention (movable mold is not shown); Figure 2 A schematic diagram of an embodiment of a casting mold for an integrated sensor of the present invention when in use (the movable mold is not shown); Figure 3 for Figure 2 Schematic diagram of the coordination status of the middle guide rod, insulating tube and shielding net; Figure 4 for Figure 1 A schematic diagram of the structure of the middle guide rod; Figure 5 for Figure 1 Schematic diagram of the structure of the middle demoulding rod.

[0019] Description of reference numerals: 1. Static mold; 2. Guide rod; 3. Capacitor slot core; 4. Demolding rod; 101. Guide rod socket; 102. Demolding rod socket; 201. Positioning plug installation groove; 202. Conical boss; 203. Moving mold sealing ring groove; 204. Drawing hole; 401. Top rod surface; 402. Stop boss; 501. Coil; 502. Shielding net; 503. Insulating tube. DETAILED DESCRIPTION

[0020] In order to provide a casting mold for an integrated sensor that is easy to demold and can improve the coaxiality of the coil and the insulating tube, the basic technical concept of the present invention is to add more than two sealing material installation grooves on the guide rod to which annular sealing materials that play a positioning and sealing role can be installed. The sealing materials in the installation grooves play a role of positioning support and sealing, ensuring that the insulating tube and the guide rod are not easy to move during the casting process, thereby ensuring the coaxiality of the coil and the insulating tube, and preventing epoxy resin from entering between the guide rod and the insulating tube, thereby facilitating demolding.

[0021] The present invention is further described in detail below in conjunction with embodiments and drawings.

[0022] Specific embodiments of the casting mold of the integrated sensor provided by the present invention: Consistent with the prior art, the casting mold of the integrated sensor provided in this embodiment also includes a movable mold and a static mold 1, which can be buckled to form multiple cavities, and the cavities are connected with flow channels for the casting material to flow in. Of course, the casting mold also includes a capacitor slot core 3 for forming a capacitor slot for placing a capacitor, and a guide rod 2 for forming a through hole in the sensor head. One end of the guide rod 2 can be inserted into the static mold 1, that is, Figure 1 As shown, the static mold 1 is provided with one end of the guide rod 2 ( Figure 4 The other end of the guide rod 2 can be inserted into the movable mold (not shown in the figure), that is, the movable mold is also provided with one end of the guide rod 2 ( Figure 4 The right side of the middle) is inserted into the jack. Figure 3 As shown, when in use, the guide rod 2 can penetrate the insulating tube 503, in other words, the insulating tube 503 can be sleeved outside the guide rod 2. Of course, during actual casting, the insulating tube 503 is also successively sleeved with a shielding net 502 and a coil 501.

[0023] Different from the prior art, Figure 4As shown, the guide rod 2 in this embodiment is provided with a positioning plugging object installation groove 201, and the positioning plugging object installation groove 201 is provided with two and is respectively located at the two ends of the guide rod 2, and a ring-shaped and compressible flexible positioning plugging object, such as a sealing ring, a rubber sleeve, etc., can be installed in the positioning plugging object installation groove 201. The distance between the two positioning plugging object installation grooves 201 is not greater than the length of the insulating tube 503 during actual production, and the positions of the two positioning plugging object installation grooves 201 meet the requirements that the positioning plugging object installed therein does not exceed the two end positions of the insulating tube 503, so that the positioning plugging object can be completely located between the insulating tube 503 and the guide rod 2, so that the plugging object can play a role in supporting the insulating tube 503 after being compressed, and prevent the insulating tube 503 from radially moving, thereby keeping the insulating tube 503 and the coil 501 (wherein the capacitor slot core 3 can also play a role in supporting the coil 501) coaxially aligned. At the same time, the positioning plugging object can also play a basic sealing role. In addition, when the staff puts the insulating tube 503 on the guide rod 2, they can start from the end of the guide rod 2 that is inserted into the movable mold. At this time, there is only one positioning blocker that is directly in contact with the insulating tube 503, and the friction force is constant. When the insulating tube 503 starts to be inserted into another positioning blocker, the friction force will increase, which also indicates that the insulating tube 503 is about to be in place, avoiding the staff's negligent operation causing the insulating tube 503 to quickly hit the conical boss 202 on the guide rod 2.

[0024] When this embodiment is in use, the corresponding casting method is as follows: during the casting operation, the combination composed of the insulating tube 503 and the shielding net 502 can be put on the guide rod 2. Before putting on the insulating tube 503, it is necessary to first put a positioning sealant on the guide rod 2. After the insulating tube 503 is put on, one end of the guide rod 2 can be inserted into the static mold 1, and then other components, such as the support frame, conductor inserts, etc., can be installed. After the installation of each part is completed, the buckled movable mold can be installed for casting. After the casting is completed, the guide rod 2 and the static mold 1 are separated to demould the semi-finished product after casting from the static mold 1, and the guide rod 2 is pulled out from the insulating tube 503 to separate the guide rod 2 and the insulating tube 503. After the guide rod 2 is pulled out, if there is a sealant stuck to the inner wall of the insulating tube 503, the sealant can be manually scraped off with a tool.

[0025] It should be noted that the figure only shows an example of a situation where there are only two positioning blocker installation grooves 201. In fact, in other embodiments, the positioning blocker installation grooves 201 can also be three or even more. In this case, the two farthest positioning blockers only need to be located at the two ends of the guide rod 2. In the case of multiple positioning blocker installation grooves 201, more blockers can be installed. In this case, the positioning effect is better, but it will also increase the resistance when the guide rod 2 is inserted and pulled out.

[0026] In order to facilitate the smooth extraction of the guide rod 2 from the insulating tube 503, in this embodiment, a pulling structure is further provided at one end of the guide rod 2 for inserting into the static mold 1. In actual use, a pulling tool can be used to cooperate with the pulling structure to extract the guide rod 2 outward. Specifically, the pulling structure can be as follows: Figure 4 The pulling hole 204 shown, when in use, can be inserted into the pulling hole 204, and then the pulling rod can be pulled outward manually or with a hand tool, thereby driving the guide rod 2 to be smoothly pulled out of the insulating tube 503. Preferably, the pulling hole 204 is a through hole, in which case the pulling rod can pass through the pulling hole 204, and both ends of the pulling rod can be stressed at the same time, thereby improving the stability when pulling the guide rod 2. Of course, the pulling structure can also be a knurled structure provided on the outer periphery of the guide rod 2 (to increase the friction with the clamping tool), and the knurled structure can actually be clamped with a clamping tool to pull out the guide rod 2.

[0027] In addition, in order to facilitate the demoulding of the semi-finished product and the guide rod 2 as a whole from the static mold 1 after casting, the present embodiment is also equipped with a demoulding rod 4. Figure 1 and Figure 2 As shown, correspondingly, a demoulding rod insertion hole 102 is also provided on the static mold 1, and the demoulding rod 4 can be inserted into the demoulding rod insertion hole 102 when in use, and the demoulding rod insertion hole 102 is connected to the guide rod insertion hole 101. The insertion end of the demoulding rod 4, i.e. Figure 1 and Figure 2 Insert one end of the demoulding rod into the hole 102, Figure 5 The right end of the middle is provided with a push rod surface 401 for pushing the guide rod 2 out of the static mold 1. The push rod surface 401 can be Figure 5 The wedge-shaped inclined surface in the embodiment, or the curved surface with a certain curvature in other embodiments. When demolding is required, the staff knocks the demolding rod 4 downward. When the demolding rod 4 moves downward, the push rod surface 401 can decompose the force of the demolding rod 4 moving downward into a force that pushes the guide rod 2 outward horizontally, thereby pushing the guide rod 2 and the semi-finished product including the coil 501, the insulating tube 503, and the shielding net 502 to be demolded from the static mold 1 as a whole. Specifically, in order to facilitate the push rod surface 401 to smoothly push the guide rod 2, a chamfered structure for cooperating with the push rod surface 401 can actually be provided at the end of the guide rod 2. The chamfered structure can be a rounded structure or a chamfered structure. Since the position of the capacitor slot core 3 is a cavity after the casting is completed, compared with directly pulling the semi-finished product outward in other embodiments, it can avoid direct contact during the demolding process to cause damage to the cavity part.

[0028] Analysis of the working principle of the demoulding rod 4 shows that if it is to be able to move downward to eject the guide rod 2, in addition to Figure 1In addition to the vertical downward movement shown in the figure, that is, the angle between the ejector rod socket 102 and the guide rod socket 101 in the extending direction is a right angle, in other embodiments, the angle between the ejector rod socket 102 and the guide rod socket 101 in the extending direction can also be greater than 90 degrees, that is, Figure 1 The demoulding rod insertion hole 102 in the mold is deflected to a certain angle toward the end away from the guide rod 2, and at this time, the demoulding rod 4 directly has the function of pushing the guide rod 2 outward.

[0029] Further, as a foolproof design, such as Figure 5 As shown, the demoulding rod 4 and the demoulding rod socket 102 are fixed and guided. Specifically, the demoulding rod 4 can be designed as a quadrilateral, hexagon, or ellipse as shown in the figure. Correspondingly, the shape of the demoulding rod socket 102 is consistent with that of the demoulding rod 4. In addition, the ejector surface 401 is arranged on the side of the demoulding rod 4 facing the guide rod 2. In this way, when the demoulding rod 4 is used normally, the demoulding rod 4 will not deflect, thereby ensuring that the ejector surface 401 can accurately push the guide rod 2.

[0030] In addition, in order to prevent the demoulding rod 4 from being inserted too far downward, resulting in the exposed length of the demoulding rod 4 being too short. If the exposed length of the demoulding rod 4 is too short, it will make it difficult to pull out the demoulding rod 4, and the staff's hand will be too close to the static mold 1 (the static mold 1 still has a relatively high temperature). The demoulding rod 4 is also provided with a stop structure for cooperating with the hole stop of the demoulding rod insertion hole 102 to limit the insertion depth of the demoulding rod 4. The stop structure is used as a safety measure to prevent the demoulding rod 4 from being inserted too far downward.

[0031] Specifically, two spaced stop bosses 402 are provided on the outer periphery of the demoulding rod 4, and the stop bosses 402 constitute the above-mentioned stop structure. This stop structure is suitable for later welding or bolting on the demoulding rod 4, and is suitable for demoulding rods 4 of different shapes. Of course, in other embodiments, the stop structure can also be a continuous annular boss on the outer periphery of the demoulding rod 4.

[0032] In order to prevent the epoxy resin from entering between the guide rod 2 and the movable mold during pouring, in this embodiment, Figure 4 As shown, the guide rod 2 is also provided with a movable mold sealing ring groove 203, and a movable mold sealing ring, such as an O-ring, can be installed in the movable mold sealing ring groove 203. During the normal casting process, the movable mold sealing ring can seal the position where the guide rod 2 and the movable mold are connected to prevent epoxy resin from entering between the guide rod 2 and the movable mold and causing the mold to be unable to be demolded. Of course, in other embodiments, the movable mold sealing ring can also be installed on the movable mold. Alternatively, no sealing ring is provided, and the sealing is achieved by using the interference fit between the guide rod 2 and the movable mold.

[0033] Specific embodiments of the casting method of the integrated sensor provided by the present invention: The embodiment of the casting method of the integrated sensor is the casting method described in the embodiment of the casting mold of the integrated sensor, which will not be described in detail here.

[0034] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. The casting mold of the integrated sensor includes a static mold, a dynamic mold and a guide rod, and is characterized in that: The guide rod is used to penetrate the insulating tube of the integrated sensor. The diameter of the guide rod is smaller than the inner hole diameter of the insulating tube so that a gap is formed between the guide rod and the insulating tube. The guide rod is provided with at least two positioning sealant mounting grooves for fitting an annular positioning sealant. The positions of the positioning sealant mounting grooves at both ends are such that the positioning sealants installed therein do not exceed the two end positions of the insulating tube. The size of the gap is such that the positioning sealant and the insulating tube are sealed and supported.

2. The casting mold of the integrated sensor according to claim 1, characterized in that: One end of the guide rod used for inserting into the static die is provided with a drawing structure used for cooperating with a drawing tool to pull out the guide rod.

3. The casting mold of the integrated sensor according to claim 2, characterized in that: The drawing structure is a drawing hole for inserting a drawing rod.

4. The casting mold of the integrated sensor according to claim 1, 2 or 3, characterized in that: One end of the guide rod for inserting into the movable mold is provided with a movable mold sealing ring groove for installing a movable mold sealing ring, wherein the movable mold sealing ring is used to seal the connection position between the guide rod and the movable mold.

5. The casting mold of the integrated sensor according to claim 1, 2 or 3, characterized in that: The casting mold also includes a demolding rod, a demolding rod socket for inserting the demolding rod is provided on the static mold, the demolding rod socket is connected with a guide rod socket on the static mold for inserting the guide rod, the angle formed by the extension direction of the demolding rod socket and the guide rod socket is not less than 90 degrees, and the insertion end of the demolding rod is provided with a push rod surface for pushing one end of the guide rod to remove the guide rod from the static mold.

6. The casting mold of the integrated sensor according to claim 5, characterized in that: One end of the guide rod used for inserting into the movable mold is provided with a chamfer structure used for matching with the ejector rod surface.

7. The casting mold of the integrated sensor according to claim 5, characterized in that: The demoulding rod and the demoulding rod insertion hole are rotation-stopping and guide-matched, and the ejector rod surface is arranged on the side of the demoulding rod facing the guide rod.

8. The casting mold of the integrated sensor according to claim 5, characterized in that: The demoulding rod is also provided with a stop structure for cooperating with the notch of the demoulding rod insertion hole to limit the insertion depth of the demoulding rod.

9. The casting mold of the integrated sensor according to claim 8, characterized in that: The stopping structure comprises more than two stopping bosses arranged at intervals on the outer circumference of the demoulding rod.

10. A method for casting an integrated sensor, characterized in that: An annular, flexible positioning plugging object is installed on the guide rod, and then the combination including the shielding net and the insulating tube is mounted on the guide rod, wherein the positioning plugging object is located at least at both ends of the insulating tube to support the insulating tube and seal the gap between the insulating tube and the guide rod. After that, the guide rod is connected to the static mold, and the other components of the integrated sensor are installed in turn and then cast. After the casting is completed, the guide rod and the insulating tube are separated.

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