Insulator easy to demould

Abstract

The utility model relates to the technical field of insulators, in particular to an insulator easy to demould, which comprises a mould main body and a demoulding guide mechanism, the mould main body comprises an upper mould and a lower mould, the opposite side surfaces of the upper mould and the lower mould are provided with mould cavities for forming the insulator, and the demoulding guide mechanism comprises two transverse side plates. A first connecting longitudinal plate is arranged between the two transverse side plates, an iron rod is detachably connected to the right side of the first connecting longitudinal plate, guide grooves are formed in the opposite side faces of the two transverse side plates correspondingly, lead screws are rotationally connected into the two guide grooves correspondingly, and moving blocks are in threaded connection with the outer walls of the two lead screws correspondingly. And a demolding frame for separating the iron rod from the insulator core is detachably connected between the two moving blocks. According to the insulator easy to demould, the servo motor drives the lead screw to be linked with the bevel gear set, the moving distance of the demoulding frame is adjustable, the insulator easy to demould can meet the demoulding requirements of insulators with different lengths, and the universality and the application range of the device are remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of insulator, concretely is an easy-to-release insulator. BACKGROUND

[0002] Insulator is an important element installed in high-voltage transmission and distribution lines and power transformation equipment, which mainly functions to reliably support and insulate high-voltage conductors and prevent current leakage to the grounding structure. Traditional insulators are usually made of porcelain or glass materials, which have good insulation performance but have the shortcomings of heavy self-weight, fragility, inconvenience in transportation and installation, etc. in actual application. In recent years, composite insulators have been widely used to solve the above problems. A composite insulator is composed of an insulating core rod, a silicone rubber umbrella cover and a metal end part, and the composite insulator core is increasingly valued in the industry. The composite insulator core is divided into solid and hollow types, with the solid type mainly used in high-voltage overhead lines as line composite insulators, and the hollow type mainly used in station insulators such as transformers, high-voltage switches and circuit breakers, etc.

[0003] When the hollow insulator is formed, the composite insulator core may have fluctuations in bending strength, impact strength and thermal deformation temperature, and may be shortened after subsequent secondary heating and pressurization. Therefore, an iron rod needs to be placed in the insulator core during forming, which provides support for the composite insulator core during injection molding to prevent the composite insulator core from being damaged due to stress expansion during forming. In the prior art, the iron rod needs to be pulled out after the insulator is produced, but due to the adhesion between the iron rod and the insulator core during injection molding, it is difficult to easily remove the iron rod by hand.

[0004] Patent No. CN218196764U discloses a release device for insulator, which comprises a base frame and a support frame. The support frame is slidably connected to the base frame, and the support frame includes a clamping block with a clamping groove. The base frame includes an iron rod mounting seat. The base frame and the support frame are relatively slidably arranged, so that the external iron rod can be relatively fixed on the base frame, and the insulator product is relatively fixed on the support frame. When the base frame and the support frame move relative to each other, the iron rod and the insulator are automatically separated.

[0005] In the prior art described above, the finished insulator is pushed out from back to front after forming by setting a pushing mechanism, while the iron rod is fixed on the bottom plate to realize the automatic separation of the insulator and the iron rod. Although this structure solves the problem of time-consuming and laborious manual pulling of the iron rod to a certain extent and improves the production efficiency, it still has limitations. Specifically, the pushing length of the existing pushing mechanism is a fixed value, which means that when producing different models or longer insulators, if the length of the insulator exceeds the maximum extendable distance of the pushing mechanism, the insulator and the iron rod cannot be completely separated, which affects the applicability and versatility of the device. In view of the deficiencies of the prior art in adaptability and demolding efficiency, it is urgent to provide an easy-to-demold insulator to meet the needs of the modern electric power equipment manufacturing industry for high efficiency and high adaptability. Practical new type content

[0006] The utility model discloses an easy-to-demold insulator to solve the problems raised in the background art.

[0007] To achieve the above object, the utility model provides the following technical scheme:

[0008] An easy-to-demold insulator, comprising a mold main body and a demolding guide mechanism, the demolding guide mechanism is used to drive the demolding frame to move to realize the separation of the iron rod and the insulator core, the mold main body comprises an upper mold and a lower mold, the opposite sides of the upper mold and the lower mold are respectively connected with driving mechanisms for driving the upper mold and the lower mold to close or separate, and opposite sides of the upper mold and the lower mold are provided with mold cavities for forming insulators;

[0009] The demolding guide mechanism comprises two horizontally opposite side plates arranged in front and back symmetry, a first connecting vertical plate is arranged between the two horizontally opposite side plates and close to the left side, the first connecting vertical plate is used to fix the iron rod and connect the horizontally opposite side plates, and the right side of the first connecting vertical plate is detachably connected with the iron rod, the iron rod is used to support the insulator core and prevent the core from deforming during the forming process;

[0010] Opposite sides of the two horizontally opposite side plates are provided with guide grooves for limiting the movement track of the lead screw and the moving block, the lead screw is rotatably connected in the two guide grooves, the lead screw drives the moving block to move along the guide groove through rotation, the outer wall of the lead screw is threadedly connected with the moving block, the moving block is used to convert the rotary motion of the lead screw into linear motion and drive the demolding frame to move, the demolding frame for separating the iron rod and the insulator core is detachably connected between the two moving blocks, the demolding frame is used to fix the insulator core and realize the separation from the iron rod through movement, and the demolding frame is located outside the mold main body.

[0011] Preferably, as Figure 1As shown, the right side of the two lateral side plates is connected with a second connecting longitudinal plate, the second connecting longitudinal plate is connected with the lateral side plate through bolts, and the second connecting longitudinal plate is used to enhance the structural stability of the lateral side plate.

[0012] Preferably, as Figure 4 As shown, a rectangular slot is arranged on the right side of the first connecting longitudinal plate and near the middle of the top edge, the rectangular slot is used for inserting the rectangular butt joint block of the iron bar to realize positioning, the left end of the iron bar is provided with a rectangular butt joint block for inserting the rectangular slot, and the rectangular butt joint block is used to limit the circumferential rotation of the iron bar and improve the connection accuracy.

[0013] A mounting hole a is arranged on the top of the first connecting longitudinal plate, the mounting hole a is used for mounting a second fastening bolt to fix the iron bar, the mounting hole a is connected with the second fastening bolt, the top of the rectangular butt joint block is provided with a second threaded groove for threadedly connecting the second fastening bolt, and the second fastening bolt is used to lock the rectangular butt joint block of the iron bar in the rectangular slot.

[0014] Preferably, as Figure 3 As shown, a transmission groove is arranged on the opposite side of the two lateral side plates and near the left side, the transmission groove is used to accommodate a rotating rod and a bevel gear set to realize power transmission, the rotating rod is rotatably connected between the two transmission grooves, the rotating rod is used to transmit power of a servo motor to the lead screw, the rear side of the rear lateral side plate is provided with a servo motor for driving the rotating rod to rotate, the servo motor is used to provide demolding power and control the moving direction and stroke of the demolding frame, the servo motor is connected with a power supply and a controller, the servo motor drives the rotating rod to rotate forward and reverse, thereby driving the two lead screws to rotate forward synchronously or reverse synchronously.

[0015] When the two lead screws rotate forward synchronously, the two moving blocks move rightward synchronously, thereby moving the demolding frame rightward, driving the insulator core containing the insulator to move rightward, and separating the insulator core from the iron bar, after the staff takes out the insulator core containing the insulator, a new insulator core is placed on the demolding frame, then the servo motor drives the rotating rod to reverse, the two lead screws reverse synchronously, thereby resetting the demolding frame, at this time, the insulator core is sleeved on the outside of the iron bar, and the next insulator production is performed.

[0016] The outer wall of the rotating rod and near the front and rear ends are provided with driving bevel gears, the driving bevel gears are used to transmit power of the rotating rod to driven bevel gears, the left end of the lead screw is located in the transmission groove, the left end of the two lead screws is provided with driven bevel gears, the two driven bevel gears are respectively meshed with the two driving bevel gears, and the driven bevel gears are used to receive power of the driving bevel gears and drive the lead screw to rotate.

[0017] Preferably, as Figure 3 and Figure 5As shown, the moving block is slidingly connected in the guide groove, the opposite sides of the two moving blocks are each provided with a U-shaped connecting seat, the U-shaped connecting seat is used for connecting the rectangular mounting seat of the demolding frame to realize detachable assembly, the middle part of the front and rear sides of the demolding frame is provided with a rectangular mounting seat, the two rectangular mounting seats are located in the two U-shaped connecting seats respectively, and the rectangular mounting seat is used for being embedded in the U-shaped connecting seat and being fixed through the first fastening bolt;

[0018] A mounting hole b is formed in the top of the U-shaped connecting seat, the mounting hole b is used for mounting the first fastening bolt to lock the rectangular mounting seat, the first fastening bolt is connected with the mounting hole b, and a first threaded groove for threaded connection of the first fastening bolt is formed in the top of the rectangular mounting seat.

[0019] Preferably, as Figure 5 As shown, the top of the demolding frame and the positions close to the left and right sides are each provided with an insulator core end positioning groove, the two ends of the insulator core are clamped in the two insulator core end positioning grooves respectively, and the insulator core end positioning groove is used for fixing the two ends of the insulator core to prevent deviation in the demolding process.

[0020] Compared with the prior art, the utility model has the advantages that:

[0021] 1、The easy-to-demold insulator realizes adjustable moving distance of the demolding frame through linkage of the servo motor, the bevel gear set and the lead screw, can adapt to the demolding requirements of insulators with different lengths, and significantly improves the universality and application range of the device.

[0022] 2、The easy-to-demold insulator automatically completes separation of the iron bar and the insulator core by utilizing the servo motor to control reciprocating movement of the demolding frame, reduces manual intervention, reduces operation difficulty, and ensures stable and efficient demolding process.

[0023] 3、The easy-to-demold insulator is provided with rigid support for the lead screw and the demolding frame through the combination design of the transverse side plate, the guide groove and the connecting longitudinal plate, avoids deviation or jamming caused by uneven stress in the demolding process, and guarantees the precision of the demolding action.

[0024] 4、The easy-to-demold insulator ensures that the iron bar maintains a fixed position during forming and demolding through cooperation of the rectangular slot and the butt block and the locking structure of the fastening bolt, and prevents deformation or cracking of the core body caused by unstable support.

[0025] 5、The easy-to-demold insulator is provided with detachable U-shaped connecting seat and rectangular mounting seat structure for the demolding frame and the moving block, facilitates quick replacement of demolding frames with different specifications, simplifies equipment maintenance process, and reduces production cost. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the whole structure schematic view of the utility model;

[0027] Figure 2 It is the whole exploded view schematic view of the utility model;

[0028] Figure 3 It is the partial structure schematic view of the utility model;

[0029] Figure 4 It is the assembly structure schematic view of the first connecting longitudinal plate, the demoulding frame and the iron bar in the utility model;

[0030] Figure 5 It is the assembly structure schematic view of the demoulding guide mechanism and the demoulding frame in the utility model;

[0031] In the drawing: 1, demoulding guide mechanism;10, transverse side plate;100, guide groove;101, transmission groove;11, first connecting longitudinal plate;110, rectangular insertion slot;111, mounting hole a;12, second connecting longitudinal plate;13, screw;130, driven bevel gear;14, rotating rod;140, driving bevel gear;15, servo motor;16, moving block;17, U-shaped connecting seat;170, mounting hole b;18, first fastening bolt;19, second fastening bolt;2, demoulding frame;20, insulator core end positioning groove;21, rectangular mounting seat;210, first threaded groove;3, mould main body;30, upper mould;31, lower mould;4, iron bar;40, rectangular butt joint block;400, second threaded groove. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0033] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0034] Please refer toFigures 1-5 The utility model provides a technical scheme:

[0035] An easy-to-demould insulator, comprising a mold main body 3 and a demoulding guide mechanism 1, the demoulding guide mechanism 1 is used to drive the demoulding frame 2 to move to realize the separation of the iron bar 4 and the insulator core, the mold main body 3 comprises an upper mold 30 and a lower mold 31, the opposite sides of the upper mold 30 and the lower mold 31 are connected with driving mechanisms respectively, for driving the upper mold 30 and the lower mold 31 to close or separate, the opposite sides of the upper mold 30 and the lower mold 31 are provided with mold cavities for forming the insulator;

[0036] As shown in Figure 1 The demoulding guide mechanism 1 comprises two transverse side plates 10 arranged in front and back symmetry, a first connecting longitudinal plate 11 is arranged between the two transverse side plates 10 and close to the left side, the first connecting longitudinal plate 11 is used to fix the iron bar 4 and connect the transverse side plate 10, the right side of the first connecting longitudinal plate 11 is detachably connected with the iron bar 4, the iron bar 4 is used to support the insulator core and prevent the core from deforming in the forming process;

[0037] As shown in Figure 3 The opposite sides of the two transverse side plates 10 are provided with guide grooves 100, the guide grooves 100 are used to limit the movement track of the lead screw 13 and the moving block 16, the lead screw 13 is rotatably connected in the two guide grooves 100, the lead screw 13 drives the moving block 16 to move along the guide groove 100 through rotation, the outer wall of the two lead screws 13 is threadedly connected with the moving block 16, the moving block 16 is used to convert the rotary motion of the lead screw 13 into linear motion and drive the demoulding frame 2 to move, the demoulding frame 2 for separating the iron bar 4 and the insulator core is detachably connected between the two moving blocks 16, the iron bar 4 and the demoulding frame 2 are designed to be detachable, when producing different models of insulators, the iron bar 4 and the demoulding frame 2 matched with the insulator can be replaced, the demoulding frame 2 is used to fix the insulator core and realize the separation from the iron bar 4 through movement, and the demoulding frame 2 is located outside the mold main body 3.

[0038] In the embodiment, as shown in Figure 1 The right sides of the two transverse side plates 10 are commonly connected with the second connecting longitudinal plate 12, the second connecting longitudinal plate 12 is connected with the transverse side plate 10 through bolts, and the second connecting longitudinal plate 12 is used to enhance the structural stability of the transverse side plate 10.

[0039] Specifically, as shown in Figure 4 The right side of the first connecting longitudinal plate 11 and the position close to the middle of the top edge are provided with a rectangular insertion slot 110, the rectangular insertion slot 110 is used for plug-in connection with the rectangular butt joint block 40 of the iron bar 4 to realize positioning, the left end of the iron bar 4 is provided with the rectangular butt joint block 40 for plug-in connection with the rectangular insertion slot 110, and the rectangular butt joint block 40 is used to limit the circumferential rotation of the iron bar 4 and improve the connection accuracy;

[0040] The top of the first connecting vertical plate 11 is provided with a mounting hole a111 for mounting the second fastening bolt 19 to fix the iron bar 4. The second fastening bolt 19 is connected to the mounting hole a111. The top of the rectangular butt joint block 40 is provided with a second threaded groove 400 for threadedly connecting the second fastening bolt 19. The second fastening bolt 19 is used to lock the rectangular butt joint block 40 of the iron bar 4 in the rectangular slot 110.

[0041] Further, as shown in Figure 3 The opposite sides of the two lateral side plates 10 and close to the left side are provided with transmission grooves 101 for accommodating the rotating rod 14 and the bevel gear set to realize power transmission. The rotating rod 14 is rotatably connected between the two transmission grooves 101. The rotating rod 14 is used to transmit the power of the servo motor 15 to the lead screw 13. The rear side of the rear lateral side plate 10 is provided with a servo motor 15 for driving the rotating rod 14 to rotate. The servo motor 15 is used to provide demolding power and control the moving direction and stroke of the demolding frame 2. The servo motor 15 is connected to a power supply and a controller for operation. The servo motor 15 drives the rotating rod 14 to rotate forward and reverse, thereby driving the two lead screws 13 to rotate forward synchronously or reverse synchronously.

[0042] When the two lead screws 13 rotate forward synchronously, the two moving blocks 16 move rightward synchronously, thereby moving the demolding frame 2 rightward, driving the insulator core containing the insulator to move rightward, and separating the insulator core from the iron bar 4. After the staff takes out the insulator core containing the insulator, a new insulator core is placed on the demolding frame 2. Then, the servo motor 15 drives the rotating rod 14 to reverse, the two lead screws 13 reverse synchronously, and the demolding frame 2 resets. At this time, the insulator core is sleeved on the outside of the iron bar 4, and the next insulator production is performed.

[0043] The outer wall of the rotating rod 14 and close to the front and rear ends are provided with driving bevel gears 140. The driving bevel gears 140 are used to transmit the power of the rotating rod 14 to the driven bevel gears 130. The left ends of the lead screws 13 are located in the transmission grooves 101. The left ends of the two lead screws 13 are provided with driven bevel gears 130. The two driven bevel gears 130 are meshed with the two driving bevel gears 140 for transmission. The driven bevel gears 130 are used to receive the power of the driving bevel gears 140 and drive the lead screws 13 to rotate.

[0044] Further, as shown in Figure 3 and Figure 5 The moving blocks 16 are slidably connected in the guide grooves 100. The opposite sides of the two moving blocks 16 are provided with U-shaped connecting seats 17. The U-shaped connecting seats 17 are used to connect the rectangular mounting seats 21 of the demolding frame 2 to realize detachable assembly. The middle portions of the front and rear sides of the demolding frame 2 are provided with rectangular mounting seats 21. The two rectangular mounting seats 21 are located in the two U-shaped connecting seats 17, respectively. The rectangular mounting seats 21 are used to be embedded in the U-shaped connecting seats 17 and be fixed by the first fastening bolts 18.

[0045] The top of the U-shaped connecting seat 17 is provided with a mounting hole b170 for mounting the first fastening bolt 18 to lock the rectangular mounting seat 21, the first fastening bolt 18 is connected to the mounting hole b170, and the top of the rectangular mounting seat 21 is provided with a first threaded groove 210 for threaded connection of the first fastening bolt 18, and the first fastening bolt 18 is used to fix the rectangular mounting seat 21 in the U-shaped connecting seat 17.

[0046] Further, as shown in Figure 5 The top of the U-shaped connecting seat 17 is provided with a mounting hole b170 for mounting the first fastening bolt 18 to lock the rectangular mounting seat 21, the first fastening bolt 18 is connected to the mounting hole b170, and the top of the rectangular mounting seat 21 is provided with a first threaded groove 210 for threaded connection of the first fastening bolt 18, and the first fastening bolt 18 is used to fix the rectangular mounting seat 21 in the U-shaped connecting seat 17.

[0047] In use, the upper mold 30 and the lower mold 31 of the mold body 3 are first closed by an external driving mechanism to form an insulator forming space in the mold cavity on the opposite sides, and then the composite insulating material is injected into the mold cavity, and the iron rod 4 provides support for the hollow composite insulator core during injection molding; after the insulator is formed, the servo motor 15 is started to drive the rotating rod 14 to rotate, the rotating rod 14 is in meshing transmission with the driven bevel gear 130 on the left end of the lead screw 13 through the driving bevel gear 140, thereby driving the two lead screws 13 to rotate synchronously in the guide groove 100 of the lateral side plate 10, so that the moving block 16 connected with the lead screw 13 moves rightward along the guide groove 100, the moving block 16 is connected with the rectangular mounting seat 21 of the demolding frame 2 through the U-shaped connecting seat 17, and is fixed by the first fastening bolt 18 passing through the mounting hole b170 and screwing into the first threaded groove 210, thereby driving the demolding frame 2 to move rightward, the demolding frame 2 fixes the two ends of the insulator core through the insulator core end positioning groove 20 on the top, and separates the insulator core from the iron rod 4 stably; after demolding, the servo motor 15 is reversed to drive the rotating rod 14, so that the lead screw 13 drives the moving block 16 to move leftward to reset, and the demolding frame 2 returns to the initial position, at this time, the finished product can be taken out and a new insulator core can be placed on the demolding frame 2 for the next round of production; when different models of insulators need to be replaced, the second fastening bolt 19 is first disassembled to separate the iron rod 4 and the first connecting longitudinal plate 11, after replacing the iron rod 4 of the appropriate model and relocking, the first fastening bolt 18 is disassembled to separate the demolding frame 2 and the moving block 16, after replacing the demolding frame 2 of the appropriate model and relocking, and the stroke parameters of the servo motor 15 are adjusted to adapt to different length requirements.

[0048] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An easy-to-demold insulator, comprising a mold body (3) and a demolding guide mechanism (1), characterized in that: The mold body (3) includes an upper mold (30) and a lower mold (31). The upper mold (30) and the lower mold (31) have mold cavities for insulator forming on their opposite sides. The demolding guide mechanism (1) includes two transverse side plates (10) arranged symmetrically front and back. A first connecting longitudinal plate (11) is provided between the two transverse side plates (10) and near the left side. An iron rod (4) is detachably connected to the right side of the first connecting longitudinal plate (11). Guide grooves (100) are provided on the opposite sides of the two transverse side plates (10). A lead screw (13) is rotatably connected in each of the two guide grooves (100). A moving block (16) is threadedly connected to the outer wall of each of the two lead screws (13). A demolding frame (2) for separating the iron rod (4) and the insulator core is detachably connected between the two moving blocks (16). The demolding frame (2) is located on the outside of the mold body (3).

2. The easily demolded insulator according to claim 1, characterized in that: The two transverse side plates (10) are connected together by a second connecting longitudinal plate (12) on their right sides. The second connecting longitudinal plate (12) is connected to the transverse side plates (10) by bolts.

3. The easily demolded insulator according to claim 1, characterized in that: A rectangular slot (110) is provided on the right side of the first connecting longitudinal plate (11) and near the middle of the top edge. A rectangular mating block (40) is provided on the left end of the iron rod (4) to be inserted into the rectangular slot (110).

4. The easy-to-demold insulator according to claim 3, characterized in that: The top of the first connecting longitudinal plate (11) is provided with a mounting hole a (111), and the mounting hole a (111) is connected to a second fastening bolt (19). The top of the rectangular mating block (40) is provided with a second thread groove (400) for the second fastening bolt (19) to be threaded.

5. The easily demolded insulator according to claim 1, characterized in that: Transmission grooves (101) are provided on opposite sides of the two transverse side plates (10) and near the left side. A rotating rod (14) is rotatably connected between the two transmission grooves (101). A servo motor (15) for driving the rotating rod (14) to rotate is provided on the rear side of the transverse side plate (10).

6. The easily demolded insulator according to claim 5, characterized in that: The outer wall of the rotating rod (14) and near the front and rear ends are provided with active bevel gears (140). The left end of the lead screw (13) is located in the transmission groove (101). The left ends of the two lead screws (13) are provided with driven bevel gears (130). The two driven bevel gears (130) mesh with the two active bevel gears (140) respectively.

7. The easy-to-demold insulator according to claim 1, characterized in that: The movable block (16) is slidably connected in the guide groove (100). The two movable blocks (16) are provided with U-shaped connecting seats (17) on opposite sides. The middle of the front and rear sides of the demolding frame (2) is provided with rectangular mounting seats (21). The two rectangular mounting seats (21) are respectively located in the two U-shaped connecting seats (17).

8. The easy-to-demold insulator according to claim 7, characterized in that: The top of the U-shaped connector (17) is provided with a mounting hole b (170), and the mounting hole b (170) is connected to a first fastening bolt (18). The top of the rectangular mounting base (21) is provided with a first threaded groove (210) for threaded connection of the first fastening bolt (18).

9. The easy-to-demold insulator according to claim 1, characterized in that: The top of the demolding frame (2) and near the left and right sides are provided with insulator core end positioning grooves (20), and the two ends of the insulator core are respectively locked in the two insulator core end positioning grooves (20).

Images