A forming method for a terminal sealing cover

Abstract

A terminal sealing cover includes a top cover, side walls, a bottom plate, and side plates; the side walls surround one side of the top cover to form a semi-enclosed space; the bottom plate is disposed within the semi-enclosed space and fixed to the side walls, with the side of the bottom plate facing the top cover, the top cover, and the side walls forming a wiring fixing area, and the side of the bottom plate facing away from the top cover, the side walls forming a snap-fit ​​fixing area; the side plates are disposed within the wiring fixing area and fixed between the top cover and the bottom plate; a guide hole is provided on the bottom plate to connect the wiring fixing area and the snap-fit ​​fixing area; the top cover is provided with a blind hole located inside the wiring fixing area, the axis of which coincides with the axis of the guide hole, and the cross-sectional shape of the blind hole along the direction of projection of the axis of the guide hole is the same as the cross-sectional shape of the guide hole. Compared with the prior art, the terminal sealing cover of the present invention does not require a process hole, thereby improving the sealing performance while reducing the amount of sealant to be filled, thus saving costs.

Description

Technical Field

[0001] The present invention relates to the field of sealing covers, and in particular to a molding method for a terminal sealing cover. Background Art

[0002] Compressors, as a device that converts low-pressure gas into high-pressure gas, are widely used in refrigeration equipment such as air conditioners and refrigerators. Compressors usually have terminals on the top, and the terminals are connected to an external power source to power the compressor. When connecting to an external power source, the terminals are generally clamped to connect the terminals. If moisture or water seepage occurs at the connection between the terminal and the terminal, leakage, short circuit, etc. will occur. Therefore, the sealing requirements for the connection between the terminal and the terminal are high, and a terminal sealing cover needs to be installed at the connection between the terminal and the terminal. During installation, the terminal sealing cover is placed on the terminal fixing seat of the compressor to fix it on the top of the compressor.

[0003] Patent application number 201821344926.2 discloses a terminal sealing cover 1 and a terminal 2. Figure 1The terminal sealing cover 1 includes a top cover 11, side walls 12, a bottom plate 13, and a side plate (not shown). The side wall 12 surrounds the top cover 11, forming a semi-enclosed space with an opening on one side. The bottom plate 13 is disposed within the semi-enclosed space and fixed to the side wall 12. The side of the bottom plate 13 facing the top cover 11, the top cover 11, and the side wall 12 together form a wiring fixing area (not shown) to accommodate the terminal 2. The side of the bottom plate 13 facing away from the top cover 11 and the side wall 12 together form a snap-fit ​​fixing area (not shown) to secure the terminal sealing cover 1 to the compressor's terminal fixing base (not shown). Within the wiring fixing area, the side wall 12 is provided with a line guide opening 121 for inserting the terminal 2 into the wiring fixing area. The side plate is disposed within the wiring fixing area and fixed between the top cover 11 and the bottom plate 13. The bottom plate 13 is provided with a guide hole 131 connecting the wiring fixing area and the snap-fit ​​fixing area. The compressor terminal (not shown) is inserted from the snap-fit ​​fixing area through the guide hole 131 into the wiring fixing area. To prevent the terminal 2 from falling out, a limit plate 100 is provided on the side of the top cover 11 facing the bottom plate 13. The limit plate 100 extends from the line guide opening 121 on the top cover 11 in the direction of insertion of the terminal 2. The limit plate 100 has a plate surface 101 facing the bottom plate 13 and a vertical surface 102 perpendicular to the top cover 11. The distance between the plate surface 101 of the limit plate 100 and the top cover 11 gradually increases along the direction of insertion of the terminal 2, that is, the limit plate 100 is inclined toward the bottom plate 13. The vertical surface 102 is located at the end away from the line guide opening 121 and is connected between the top cover 11 and the plate surface 101.

[0004] In addition, the terminal sealing cover 1 is generally produced using injection molding technology. Due to the influence of the molding mold, it is necessary to open a process hole 122 on the side wall 12 to connect the wiring fixing area with the outside of the terminal sealing cover, and the process hole 122 is directly opposite to the line guide port 121. Preferably, the extension direction of the process hole 122 is perpendicular to the vertical surface 102. During injection molding, two cores are inserted from the line guide port 121 and the process hole 122 respectively, and the molding is performed with the plane where the vertical surface 122 is located as the parting surface and the direction perpendicular to the vertical surface 122 as the mold opening direction. In other words, the terminal sealing cover 1 is molded by using two cores whose mold opening directions are parallel to each other.

[0005] See also Figure 2The terminal block 2, which cooperates with the terminal block sealing cover 1, includes a main body 21, a resilient clip 22, and two opposing connecting pieces 23. The main body 21 has an upper end surface 211 and a lower end surface 212 that are parallel to each other. The two connecting pieces 23 are opposite and connected between the upper end surface 211 and the lower end surface 212, forming a space for accommodating the terminal block. The resilient clip 22 is made of elastic material and has a fixed end 221 and a movable end 222. The fixed end 221 is fixed to the upper end surface 211, and the movable end 222 rotates with the fixed end 221 as a fulcrum to move away from or toward the upper end surface 211. When the terminal 2 is inserted into the wiring fixing area of ​​the terminal post sealing cover 1, the lower end surface 212 is in contact with the bottom plate 13 of the terminal post sealing cover 1, the upper end surface 211 faces the top cover 11 of the terminal post sealing cover 1, the fixed end 221 is located on the side away from the line guide port 121, and the movable end 222 is located on the side close to the line guide port 121.

[0006] During use, the terminal block 2 is inserted into the terminal block sealing cover 1 through the line guide opening 121 until the movable end 222 passes through the vertical surface 102. The vertical surface 102, with its snap-fit ​​structure against the movable end 222, restricts the terminal block 2 from moving toward the line guide opening 121. The terminal block sealing cover 1 and the terminal block 2 are then assembled into a top cover assembly (not shown). The locking and securing area of ​​the terminal block sealing cover 1 is then fitted over the compressor's terminal block, which is located between the two terminal lugs 23. Finally, sealant is applied to the securing area, the process hole 122, and the connection between the terminal block sealing cover 1 and the terminal block holder to achieve a seal.

[0007] As can be seen from the above-mentioned terminal sealing cover, in the prior art, in order to prevent the terminal from falling off from the terminal sealing cover, a mutually cooperating snap-fit ​​structure needs to be set between the terminal and the terminal sealing cover. However, the existing snap-fit ​​structure often needs to provide a process hole for the mold core to enter and exit during injection molding. Accordingly, a large amount of sealant needs to be injected into the process hole when filling the sealant. If the sealant is not filled in enough, its sealing performance will be affected to a certain extent. In addition, the inclined limit plate forms an angle with the upper end face of the terminal, which can easily cause the terminal to fall off, and there may also be a situation where the sealant is not completely filled, further affecting the sealing performance. Summary of the Invention

[0008] Based on this, an object of the present invention is to provide a terminal sealing cover that does not require a process hole.

[0009] The technical solution adopted by the present invention is as follows:

[0010] A terminal sealing cover, comprising a top cover, side walls, a bottom plate and side plates; the side walls surround one side of the top cover to form a semi-enclosed space; the bottom plate is arranged in the semi-enclosed space and fixed on the side walls, a wiring fixing area is formed by the side of the bottom plate facing the top cover, the top cover and the side walls, and a snap-fit ​​fixing area is formed by the side of the bottom plate facing away from the top cover and the side walls; the side plates are arranged in the wiring fixing area and fixed between the top cover and the bottom plate; a guide hole connecting the wiring fixing area and the snap-fit ​​fixing area is provided on the bottom plate; a blind hole whose axis coincides with the axis of the guide hole is provided on the inner side of the top cover located in the wiring fixing area, and the cross-sectional shape of the blind hole is the same as the cross-sectional shape of the guide hole along the direction of projection of the axis of the guide hole.

[0011] The terminal sealing cover of the present invention does not need to be provided with a process hole, thereby improving the sealing performance and reducing the amount of sealant filling, thus saving costs. In addition, the process of filling the process hole with sealant is reduced, which is conducive to improving production efficiency.

[0012] Furthermore, the inner side surface of the top cover located in the wiring fixing area is parallel to the bottom plate. When the terminal is inserted into the terminal post sealing cover, the gap between the top cover and the terminal is uniform, which is conducive to filling the sealant and thus improving the sealing performance.

[0013] Furthermore, a line guide opening is provided on the side wall of the wiring fixing area; and a stopper protruding toward the bottom plate is provided on the inner side surface of the top cover located in the wiring fixing area; the stopper is disposed between the blind hole and the line guide opening. The stopper can further prevent the wiring terminal from falling off.

[0014] Furthermore, the invention further comprises a positioning plate provided in the wiring fixing area, the positioning plate being connected between the top cover and the bottom plate, and the blind hole being located between the positioning plate and the line guide opening. When the terminal is inserted into the terminal post sealing cover, the positioning plate plays a role in positioning the terminal.

[0015] Furthermore, the axis of the guide hole is perpendicular to the bottom plate.

[0016] Furthermore, the invention comprises at least two mutually parallel side panels, wherein adjacent side panels, the bottom panel and the top cover form a wiring space; each wiring space is provided with a guide hole and a blind hole opposite thereto, and the plurality of wiring spaces are provided with a plurality of terminal blocks for insertion.

[0017] In addition, the present invention also provides a method for forming a terminal sealing cover, comprising the following steps:

[0018] A method for forming a terminal sealing cover comprises providing a mold for the terminal sealing cover, the mold comprising a cavity and a core assembly disposed in the cavity, and comprising the following steps:

[0019] A first core is provided; the first core comprises a forming seat, a forming column and a cover forming block; the forming column and the cover forming block are provided on the same side end surface of the forming seat, and the height of the cover forming block is less than the height of the forming column, and the cover forming block surrounds the forming column on three sides; the mold opening direction of the first core is parallel to the axis direction of the forming column;

[0020] A second core is provided; the second core includes a wire insertion space forming block and a through hole penetrating the wire insertion space forming block, and a cross-sectional shape of the through hole projected along the axis of the through hole is the same as a cross-sectional shape of the forming column projected along the axis of the forming column; an opening direction of the second core is not parallel to the axis of the through hole;

[0021] Inserting the forming column of the first core into the through hole of the second core to form a core group; the wire insertion space forming block is fitted with the cover forming block, and one end surface extends outside the forming seat;

[0022] A cavity is provided and the core group is arranged in the cavity to perform injection molding of the terminal sealing cover; a gap is formed between the molding seat and the wiring space molding block, and the molding column is exposed outside the wiring space molding block;

[0023] The first core is separated from the terminal sealing cover in a direction parallel to the axis of the molding column;

[0024] After the first core leaves the terminal sealing cover, the second core separates from the terminal sealing cover along the mold opening direction.

[0025] Compared with the prior art, the molding method of the terminal sealing cover can realize the injection molding of the terminal sealing cover with a snap-fit ​​structure without setting a process hole, and the produced terminal sealing cover has higher sealing performance.

[0026] Furthermore, the axis of the forming column is perpendicular to the end surface of the forming seat connected thereto.

[0027] Furthermore, in the plug-in space forming block, both sides of the through hole are parallel to the end face of the forming seat where the forming column is located. The top cover of the obtained terminal post sealing cover is parallel to the end face of the terminal.

[0028] Furthermore, after the core assembly is assembled, the end surface of the second core's wire insertion space forming block located outside the forming seat is the outer end surface, and the end surface parallel to and directly opposite the outer end surface is the inner end surface. A gap is provided between the inner end surface and the cover forming block of the first core. The resulting terminal sealing cover is provided with a positioning plate.

[0029] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the cross-sectional structure of a terminal sealing cover in the prior art;

[0031] Figure 2 This is a structural diagram of a wiring terminal in the prior art;

[0032] Figure 3 Schematic diagram of the overall structure of the terminal sealing cover in the present invention;

[0033] Figure 4 It is a schematic structural diagram of the terminal sealing cover of the present invention taken along AA section;

[0034] Figure 5 It is a structural schematic diagram of the upper cover assembly of the present invention viewed along AA;

[0035] Figure 6 Schematic diagram of the structure of the core assembly used for forming the terminal sealing cover in the present invention;

[0036] Figure 7 This is a schematic diagram of the installation of the medium core group of the present invention;

[0037] Figure 8 It is a structural schematic diagram of the mold along AA in the present invention. DETAILED DESCRIPTION

[0038] Please refer to Figure 3 and Figure 4The terminal sealing cover 1 of the present invention includes a top cover 11, side walls 12, a bottom plate 13, and side plates 14. The side walls 12 surround the top cover 11, forming a semi-enclosed space with an opening on one side. The bottom plate 13 is disposed within the semi-enclosed space and fixed to the side walls 12. The side of the bottom plate 13 facing the top cover 11, the top cover 11, and the side walls 12 collectively form a wiring fixing area (not shown) for accommodating the terminal 2. The side of the bottom plate 13 facing away from the top cover 11, together with the side walls 12, forms a snap-fit ​​fixing area (not shown) for securing the terminal sealing cover 1 to the compressor's terminal fixing base (not shown). Within the wiring fixing area, the side walls 12 are provided with a line guide opening 121 for inserting the terminal 2 into the wiring fixing area. The side plates 14 are disposed within the wiring fixing area and fixed between the top cover 11 and the bottom plate 13. The bottom plate 13 is provided with a guide hole 131 connecting the wiring fixing area and the snap-fit ​​fixing area. The compressor's terminal (not shown) is inserted from the snap-fit ​​fixing area through the guide hole 131 into the wiring fixing area. The top cover 11 is provided with a blind hole 111 on the inner side of the wiring fixing area, with its opening facing the bottom plate 13. The axis of the blind hole 111 coincides with the axis of the guide hole 131, and the cross-sectional shape of the blind hole 111, projected along the axis of the guide hole 131, is the same as the cross-sectional shape of the guide hole 131. After the terminal is inserted into the terminal sealing cover 1, it is located within the blind hole 111. Preferably, the axes of the terminal and the blind hole 111 are both perpendicular to the bottom plate 13.

[0039] Furthermore, the number of the side panels 14 is more than two, and multiple parallel side panels 14 are connected between the bottom panel 13 and the top cover 11. The adjacent side panels 14, the bottom panel 13, and the top cover 11 together form a wire insertion space, and each wire insertion space is provided with a guide hole and a blind hole opposite thereto, thereby achieving the purpose of dividing the wiring fixing area into multiple wire insertion spaces according to the number of the terminal posts. In this embodiment, the number of the terminal posts on the terminal post fixing seat is three, and the wiring fixing area is divided into three wire insertion spaces by two side panels 14. Accordingly, each wire insertion space is provided with the blind hole 111 and the guide hole 131, that is, the number of the blind hole 111 and the guide hole 131 are both three.

[0040] Furthermore, to better mate the upper end surface 211 of the terminal block 2 with the terminal post sealing cover 1, the inner side surface of the top cover 11 located in the terminal fixing area is parallel to the bottom plate 13. Preferably, the distance between the top cover 11 and the bottom plate 13 is equal to the distance between the upper end surface 211 and the lower end surface 212 of the terminal block 2, and is less than the distance between the movable end 222 and the lower end surface 212. After the terminal block 2 is inserted into the terminal post sealing cover 1, the upper end surface 211 and the lower end surface 212 of the terminal block 2 mate with the top cover 11 and the bottom plate 13, respectively, to prevent the terminal block 2 from falling off.

[0041] Furthermore, the top cover 11 is provided with a stopper 112 on the inner side of the wiring fixing area, protruding toward the bottom plate 13. The stopper 112 is located between the blind hole 111 and the line guide opening 121. When the terminal 2 is inserted into the terminal sealing cover 1 through the line guide opening 121, the elastic clip 22 of the terminal 2 slides along the top cover 11 and is compressed and elastically deformed when it reaches the stopper 112. After passing through the stopper 112, the elastic clip 22 returns to its original shape. The stopper 112 presses against the movable end 222 of the elastic clip 22, thereby limiting the movement of the terminal 2 toward the line guide opening 121. The movable end 222 cooperates with the stopper 112 on the inner side of the top cover 11 to form a snap structure, further preventing the terminal 2 from falling off.

[0042] Furthermore, to better position the terminal block 2 when it is inserted, the terminal block sealing cover 1 further includes a positioning plate 15. The positioning plate 15 is connected between the top cover 11 and the bottom plate 13, and the blind hole 111 is located between the positioning plate 15 and the line guide opening 121. When the terminal block 2 is inserted into the terminal block sealing cover 1, and the side of the terminal block 2 facing the line guide opening 121 presses against the positioning plate 15, the fixed end 221 of the terminal block is located on one side of the positioning plate 15, and the movable end 222 is located within the blind hole 111, thereby achieving the positioning of the terminal block 2.

[0043] See also Figure 5The present invention also provides a top cover assembly 3, comprising any of the above-described terminal block sealing covers 1 and the terminal block 2. The terminal block 2 is inserted into the wiring fixing area through the line guide opening 121 of the terminal block sealing cover 1. The fixed end 221 of the terminal block 2 is located on the side away from the line guide opening 121, and the movable end 222 is located on the side closer to the line guide opening 121. The terminal block 2 is pushed away from the line guide opening 121 until the side of the terminal block 2 away from the line guide opening 121 presses against the positioning plate 15. During the movement of the terminal block 2, the movable end 222 of the elastic clip 22 passes through the limit block 112 and undergoes elastic deformation. After entering the blind hole 111, it returns to its original shape. The limit block 112 presses against the movable end 222 of the elastic clip 22, thereby restricting the movement of the terminal block 2 toward the line guide opening 121 and preventing the terminal block 2 from falling off the terminal block sealing cover 1. The locking and fixing area of ​​the terminal sealing cover 1 opens toward the terminal fixing seat on the compressor, and the upper cover assembly 3 is sleeved onto the terminal fixing seat. The terminal is inserted into the wiring fixing area from the guide hole 131 and is held tightly by the two terminal pieces 23 of the terminal 2. Finally, sealant is filled into the line guide opening 121 and the joint between the terminal sealing cover 1 and the terminal fixing seat to achieve sealing. Since the distance between the upper end face 211 and the top cover 11 is small, only a small amount of sealant is needed to achieve sealing. Moreover, since the distance between the upper end face 211 of the terminal 2 and the top cover 11 is relatively uniform, the sealant is evenly distributed between the terminal and the top cover 11, and it is not easy to generate a gap, thereby improving the sealing performance.

[0044] To achieve the production of the aforementioned terminal post sealing cover 1, the present invention also provides a method for molding the terminal post sealing cover. This method eliminates the need for providing the process hole 122 in the terminal post sealing cover 1. This molding method utilizes the guide hole 131 of the terminal post sealing cover 1 and is achieved by using two cores with non-parallel mold opening directions, one of which has a mold opening direction parallel to the axis of the guide hole.

[0045] For details, please refer to Figures 6 to 8 The molding method of the terminal sealing cover of the present invention is implemented by providing a terminal sealing cover mold, wherein the mold includes a mold cavity (not shown) and a core group 4, wherein the core group 4 includes a first core 41 and a second core 42 whose mold opening directions are not parallel to each other. Specifically, the method includes the following steps:

[0046] Step S10: Set the first core 41. The first core 41 includes a molding seat 411, a molding column 412 and a cover molding block 413. The molding column 412 extends on the first end face 4111 of the molding seat 411, and the mold opening direction of the first core 41 is parallel to the extension direction of the molding column 412. Preferably, the axis of the molding column 412 is perpendicular to the first end face 4111. The cover molding block 413 is a protrusion fixed on the first end face 4111, and its second end face 4131 away from the molding seat 411 is parallel to the first end face 4111. The height of the cover molding block 413 relative to the first end face 4111 is less than the height of the molding column 412 relative to the first end face 4111, and the cover molding block 413 surrounds the molding column 412 on three sides.

[0047] Step S20: Set the second core 42. The second core 42 includes a wire plug-in space forming block 421 and a through hole 422, and the mold opening direction of the second core 42 is not parallel to the axis of the through hole 422; preferably, the mold opening direction of the second core 42 and the axis of the through hole 422 are perpendicular to each other. The extension direction of the wire plug-in space forming block 421 is the same as the insertion direction of the terminal 2, thereby realizing the forming of the wire plug-in space. The through hole 422 is a through hole provided on the wire plug-in space forming block 421, and the cross-sectional shape of the through hole 422 obtained by projecting along the axis of the through hole 422 is the same as the cross-sectional shape of the forming column 412 obtained by projecting along the axis of the forming column 412. Preferably, in the wire insertion space forming block 421 , the third end face 4211 and the fourth end face 4212 passed through by the through hole 422 are parallel to each other; further, the third end face 4211 and the fourth end face 4212 are both parallel to the first end face 4111 .

[0048] Step S30: The molding column 412 of the first core 41 is inserted into the through hole 422 of the second core 42 to form the core assembly 4. Of the four end faces of the wire insertion space molding block 421, three of the four end faces connected between the third end face 4211 and the fourth end face 4212 mate with the cover molding block 413, while the remaining end face is located outside the molding seat 411 and is referred to as the outer end face 4213; preferably, the outer end face 4213 is perpendicular to the first end face 4111.

[0049] Step S40: Place the core assembly 4 into a matching mold cavity (not shown) to perform injection molding of the terminal sealing cover 1. Supported by the mold cavity, a gap is formed between the wire insertion space forming block 421 and the molding seat 411. The molding post 412 passes through the through hole 422 and is exposed outside the wire insertion space forming block 421. In the wire insertion space forming block 421, the third end surface 4211 is distal to the molding seat 411. Preferably, the distance from the third end surface 4211 to the first end surface 4111 is equal to the distance from the second end surface 4131 to the first end surface 4111.

[0050] When the second core 42 is inserted into the first core 41, the plug-in space forming block 421, the forming seat 411, the cover body forming block 413, and the cavity together form the top cover 11, the side walls 12, and the side panels 14 of the terminal sealing cover 1; the gap between the plug-in space forming block 421 and the forming seat 411, together with the cavity, forms the bottom plate 13. Because the forming column 412 is disposed on the forming seat 411 and passes through and is exposed outside the plug-in space forming block 421, that is, the forming column 412 passes through the bottom plate 13 and is inserted into the top cover 11, a coaxial guide hole 131 and a blind hole 111 are formed on the bottom plate 13 and the top cover 11, respectively.

[0051] Further, in step S30, after the core group 4 is formed, in the wire insertion space forming block 421, the end face parallel to and opposite to the outer end face 4213 is the inner end face 4214, and the through hole 422 is located between the outer end face 4213 and the inner end face 4214, and a gap is provided between the inner end face 4214 and the cover body forming block 413 to form the positioning plate 15.

[0052] In this embodiment, corresponding forming columns 412 and wire insertion space forming blocks 421 are set according to the number and position of the terminal posts; the axis of the forming column 412 is perpendicular to the first end face 4111; after the core group 4 is formed, the third end face 4211 and the fourth end face 4212 are both parallel to the first end face 4111; the inner end face 4214 is perpendicular to the first end face 4111.

[0053] Step S50 : After the terminal post sealing cover 1 is injection molded, the first core 41 moves away from the terminal post sealing cover 1 along the axis direction of the molding post 412 .

[0054] Step S60: After the first core 41 is away from the terminal sealing cover 1, the second core 42 moves away from the terminal sealing cover 1 along a direction parallel to the first end surface 4111; the terminal sealing cover 1 is demoulded.

[0055] That is, during injection molding, the mold opening directions of the first core 41 and the second core 42 are not parallel to each other. In addition, based on the positional relationship between the insertion direction of the terminal 2 and the terminal, the angle between the mold opening directions of the first core 41 and the second core 42 is set to any value between greater than 0 degrees and less than 90 degrees, thereby enabling the terminal 2 to be inserted into the terminal sealing cover 1 at different angles.

[0056] Compared to the prior art, the terminal sealing cover of the present invention does not require a process port, which improves sealing while reducing the amount of sealant required, thus saving costs. Furthermore, the process of filling the process port with sealant is reduced, which helps improve production efficiency. Furthermore, the end face of the sealing cover in the upper cover assembly of the present invention fits tightly against the terminal and is provided with a snap-fit ​​structure, making the terminal less likely to fall off. Furthermore, the molding method of the terminal sealing cover of the present invention enables the injection molding production of the aforementioned terminal sealing cover.

[0057] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A method for forming a terminal sealing cover, comprising providing a terminal sealing cover mold, the mold comprising a cavity and a core assembly disposed in the cavity, wherein: The following steps are involved: A first core is provided; the first core comprises a forming seat, a forming column and a cover forming block; the forming column and the cover forming block are provided on the same side end surface of the forming seat, and the height of the cover forming block is less than the height of the forming column, and the cover forming block surrounds the forming column on three sides; the mold opening direction of the first core is parallel to the axis direction of the forming column; the number of the forming columns is three or more; A second core is provided; the second core includes a wire insertion space forming block and a through hole provided corresponding to each forming column and penetrating the wire insertion space forming block, and the cross-sectional shape of the through hole projected along the axis of the through hole is the same as the cross-sectional shape of the forming column projected along the axis of the forming column; the mold opening direction of the second core is not parallel to the axis of the through hole; Inserting the forming column of the first core into the through hole of the second core to form a core group; the wire insertion space forming block is fitted with the cover forming block, and one end surface extends outside the forming seat; A cavity is provided and the core group is arranged in the cavity to perform injection molding of the terminal sealing cover; a gap is formed between the molding seat and the wiring space molding block, and the molding column is exposed outside the wiring space molding block; The first core is separated from the terminal sealing cover in a direction parallel to the axis of the molding column; After the first core leaves the terminal sealing cover, the second core separates from the terminal sealing cover along the mold opening direction.

2. The method for forming a terminal sealing cover according to claim 1, wherein: The axis of the forming column is perpendicular to the end surface of the forming seat connected thereto.

3. The method for forming a terminal sealing cover according to claim 1, wherein: In the wire insertion space forming block, both side surfaces penetrated by the through hole are parallel to the end surface of the forming seat where the forming column is located.

4. The method for forming a terminal sealing cover according to claim 3, wherein: After the core group is formed, the end face located outside the forming seat in the wire insertion space forming block of the second core is the outer end face, and the end face parallel to and opposite to the outer end face is the inner end face; there is a gap between the inner end face and the cover forming block of the first core.

5. The method for forming a terminal sealing cover according to claim 1, wherein: The included angle between the mold opening directions of the first core and the second core is set to be greater than 0 degrees and less than or equal to 90 degrees.

6. The method for forming a terminal sealing cover according to claim 1, wherein: A first end surface perpendicular to the axis of the forming column is provided on the first core, and the cover forming block is provided on the first end surface.

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