A kind of external glue-mounted rod-shaped pillar porcelain insulator

Abstract

The present invention discloses an externally mounted rod-shaped post porcelain insulator, comprising an insulating rod body, the end of which is provided with a connecting accessory. The connecting accessory is characterized in that the connecting accessory comprises: a pre-installed component, which is sleeved over the end of the insulating rod body and fixedly connected to the insulating rod body; a post-installed component, which is sleeved over the pre-installed component and detachably connected to the pre-installed component; and a connecting end at the end of the post-installed component facing away from the insulating rod body, which is used to connect to an external accessory. The present invention provides an externally mounted rod-shaped post porcelain insulator, which can meet the needs of different customers through the design of replaceable connecting accessories, thereby allowing the insulating rod body portion to use the same standard parts, thereby reducing inventory.

Description

Technical Field

[0001] The invention relates to the technical field of insulators, in particular to an externally glued rod-shaped pillar porcelain insulator. Background Art

[0002] Externally mounted porcelain rod post insulators are a common type of rod post insulator. They are primarily used for insulating and mechanically securing busbars and electrical equipment in power plants and substations. They are also often used as components in electrical equipment such as disconnectors and circuit breakers.

[0003] The externally glued rod-shaped pillar porcelain insulators in the prior art generally include porcelain parts and connecting accessories located at both ends of the porcelain parts. The porcelain parts and the connecting accessories are fixedly connected by cement adhesive. Due to the process requirements such as the maintenance of the cement adhesive, in order to meet the timeliness of customer orders, the existing connecting accessories and porcelain parts need to be glued and fixed in advance, and the finished products are placed in the warehouse for storage and preparation. However, since customers have different requirements for the size and shape of the connecting accessories, there will be differences in the installation accessories for different customers, different models, and different sizes. This leads to a wide variety of insulators, a heavy warehousing burden, and a serious problem of capital retention. Summary of the Invention

[0004] The present invention aims to solve one of the technical problems in the related art to a certain extent at least: to provide an externally-mounted rod-shaped post porcelain insulator, which can meet the needs of different customers through the design of replaceable connecting accessories, so that the insulating rod body part can adopt the same standard parts, thereby reducing inventory.

[0005] To this end, an object of the present invention is to provide an externally-mounted rod-shaped post porcelain insulator, which includes an insulating rod body, and a connecting accessory is provided at the end of the insulating rod body, characterized in that the connecting accessory includes:

[0006] A pre-installed component is sleeved outside the end of the insulating rod and is fixedly connected to the insulating rod;

[0007] The rear installation part is sleeved outside the pre-installation part and is connected to the pre-installation part in a detachable manner;

[0008] The end of the rear-mounted component facing away from the insulating rod body has a connection end for connecting to an external accessory. The pre-mounted component is first fixedly connected to the insulating rod body using cement adhesive, thereby making the semi-finished insulator formed by the fixed connection between the pre-mounted component and the insulating rod body a standard universal component. Through the detachable connection between different rear-mounted components and the pre-mounted component, different models and sizes of rear-mounted components can be arbitrarily replaced according to needs, so that the final installed finished insulator meets different customer needs. At the same time, the manufacturer only needs to stock the semi-finished insulator and multiple models of rear-mounted components, which reduces storage costs.

[0009] According to an example of the present invention, the outer side wall of the pre-installation component and the inner side wall of the post-installation component are threadedly connected.

[0010] According to one embodiment of the present invention, a locking member is provided between the pre-installation member and the post-installation member to restrict circumferential rotation of the post-installation member. When the insulator is used in electrical equipment such as disconnect switches, which are subject to repeated opening and closing movements and rotation, the locking member is provided to prevent the risk of rotational disengagement between the post-installation member and the pre-installation member. The addition of the locking member restricts rotation between the post-installation member and the pre-installation member, thus preventing the risk of the insulator disengaging during use.

[0011] According to an example of the present invention, the locking member is a latch, the side wall of the rear mounting member has a socket for the latch to pass through, and the outer side wall of the pre-mounting member has a countersunk hole;

[0012] When the post-installation part is rotated to correspond to the countersunk hole, the portion of the pin is inserted into the countersunk hole through the insertion hole. The design of the pin allows the insertion hole on the side wall of the post-installation part to align with the countersunk hole on the outer wall of the pre-installation part after the post-installation part and the pre-installation part are screwed together. At this time, the insertion of the pin can limit the circumferential direction of the post-installation part and the pre-installation part by the pin.

[0013] According to one example of the present invention, the locking member is a lock tongue, and the outer side wall of the pre-installed member and the inner side wall of the post-installed member respectively have a mounting groove for accommodating the lock tongue and a slot matching the front end of the lock tongue, and a thrust spring is provided between the rear end of the lock tongue and the bottom of the mounting groove;

[0014] When the rear-mounted component rotates relative to the pre-mounted component until the slot aligns with the mounting slot, the front end of the locking tongue is pushed into the slot by the thrust spring. By providing a slot and mounting slot on the inner sidewall of the rear-mounted component and the pre-mounted component, respectively, as the threads of the rear-mounted component and the pre-mounted component are tightened, when the mounting slot aligns with the slot, the locking tongue automatically pops out and inserts into the slot under the action of the thrust spring. This lock tongue can thus circumferentially limit the position of the rear-mounted component and the pre-mounted component. At the same time, because the outer surface of the rear-mounted component is not penetrated by the mounting slot, the outer surface of the rear-mounted component remains intact. This helps reduce the ingress of rainwater into the pre-mounted component when used outdoors.

[0015] According to one example of the present invention, the slot extends axially to form an elongated structure, and the front end of the lock tongue has a front guide surface; when the lock tongue rotates relative to the slot in the screw-in direction, the front guide surface abuts against the inner wall of the slot, so that the lock tongue retracts and escapes the circumferential constraint of the slot. The design of the front guide surface allows the rear mounting part to be smoothly screwed with the pre-mounted part when it rotates in the screw-in direction, that is, the lock tongue can smoothly pass through the elongated slot when it rotates in the screw-in direction, thereby allowing the rear mounting part to rotate normally in the opposite direction of the screw-in direction, and when it rotates in the screw-out direction opposite to the screw-in direction, the lock tongue will be stuck in the slot, thereby achieving circumferential limitation.

[0016] According to one example of the present invention, the slot extends axially to the end surface of the rear mounting part or pre-mounted part in which the slot is located, and the front end of the lock tongue has a rear guide surface on the side facing away from the front guide surface. A movable member that slides with the slot is provided between the rear guide surface and the inner wall of the slot, one end of the movable member is exposed outside the slot, and the movable member has a guide inclined surface that matches the rear guide surface.

[0017] When the lock tongue rotates in the direction of screwing out and the movable member is pulled out of the slot, the rear guide surface is located in the slot and the side surface of the lock tongue abuts against the inner wall of the slot;

[0018] When the lock tongue rotates in the direction of screwing out and the movable member is inserted between the inner wall of the slot and the lock tongue, the guide bevel abuts against the rear guide surface before the inner wall of the slot, so that a portion of the rear guide surface is exposed outside the slot. Insertion or extraction of the movable member can limit or freely rotate the lock tongue and the slot in the direction of screwing out, so that after the movable member is inserted, the rear installation member can be rotated in the direction of screwing out to separate from the pre-installed member. This process can facilitate the replacement of the rear installation member on the product. At the same time, after the movable member is extracted, the limit between the rear installation member and the pre-installed member in the direction of screwing out is not affected.

[0019] According to an example of the present invention, there are multiple locking members, and the multiple locking members are evenly distributed along the circumference.

[0020] According to an example of the present invention, there are four locking members.

[0021] According to one example of the present invention, the inner sidewall of the pre-installed component has a plurality of ribs evenly distributed along the circumference, with arcuate grooves formed between any two adjacent ribs, and the locking member is circumferentially positioned at positions corresponding to the ribs. The design of the arcuate grooves allows the cement adhesive to better securely connect the outer surface of the end of the insulating rod to the inner surface of the pre-installed component, thereby improving the connection strength. At the same time, the position of the ribs corresponds to the position of each locking tongue. The advantage of this design is that the mounting grooves or slots that match the locking tongues are located where the ribs are located. Thus, the ribs can still provide good strength, reducing the problem of reduced strength of the pre-installed component caused by the provision of the mounting grooves or slots.

[0022] The above technical solution has the following advantages or beneficial effects: a pre-installed part of a standard size can be fixedly connected to the original insulating rod body using the original process to form a semi-finished insulator, and the semi-finished insulator can be detachably connected to a variety of post-installed parts, thereby meeting the needs of different shapes and sizes and reducing inventory.

[0023] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an axonometric view of the externally-mounted rod-shaped post porcelain insulator of the present invention.

[0025] Figure 2 It is a side view of the externally-mounted rod-shaped post porcelain insulator of the present invention.

[0026] Figure 3 for Figure 2 Cross-sectional view in the "AA" direction.

[0027] Figure 4 for Figure 3 A partial enlarged schematic diagram of the "B" area in the middle.

[0028] Figure 5 It is a schematic diagram of the three-dimensional structure of the connecting accessories in the present invention.

[0029] Figure 6 yes Figure 5 Side view of the connecting accessory.

[0030] Figure 7 for Figure 6 Cross-sectional view in the “CC” direction.

[0031] Figure 8 for Figure 7 Cross-sectional view in the “DD” direction.

[0032] Figure 9 for Figure 8 A partial enlarged schematic diagram of the "E" area in the middle.

[0033] Figure 10 for Figure 8 A three-dimensional schematic diagram of a mid-section view.

[0034] Figure 11 for Figure 10 A partial enlarged schematic diagram of the "F" area in the middle.

[0035] Figure 12 It is an isometric view of the first structure of the movable part in the present invention.

[0036] Figure 13 It is an isometric view of the second structure of the movable part in the present invention.

[0037] Figure 14 for Figure 13 Side view of the movable part of the second structure.

[0038] Among them, 100, insulating rod; 200, connecting accessories;

[0039] 1. Pre-installed part; 2. Rear-installed part; 3. Connecting end; 4. Lock tongue; 4.1. Rear side; 5. Mounting groove; 6. Slot; 7. Thrust spring; 8. Front guide surface; 9. Rear guide surface; 10. Movable part; 10.1. Guide slope; 11. Rib; 12. Arc groove; 13. Handheld end; 13.1. Notch; 13.2. Bending point. DETAILED DESCRIPTION

[0040] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0041] The following describes in detail an externally-molded rod-shaped post porcelain insulator according to an embodiment of the present invention with reference to the accompanying drawings.

[0042] The present invention provides an externally-mounted rod-shaped post porcelain insulator, as shown in the figure, which includes an insulating rod body 100, and a connecting accessory 200 is provided at the end of the insulating rod body 100. The connecting accessory 200 is characterized in that the connecting accessory 200 includes:

[0043] The pre-installed component 1 is sleeved on the end of the insulating rod 100 and fixedly connected to the insulating rod 100;

[0044] The rear installation component 2 is sleeved outside the pre-installation component 1 and is detachably connected to the pre-installation component 1;

[0045] The end of the rear mounting member 2 facing away from the insulating rod body 100 has a connecting end 3 for connecting to an external accessory.

[0046] The insulating rod 100 is made of, but not limited to, ceramic or glass.

[0047] like Figure 1 and Figure 2 As described above, both the upper and lower ends of the insulator are provided with the connection accessories 200. Of course, based on the adjustments of this embodiment, in the actual production process, the connection accessory 200 may be installed at one end of the insulating rod body 100, and the other end may be empty, or other accessories may be installed at the other end. These improvements should all belong to conventional adjustments within the scope of protection of the present invention.

[0048] In addition, the connecting accessory 200 can be formed by processing metal materials, which is also called metal accessories in the industry.

[0049] Based on the specific example of the detachable connection between the pre-installation component 1 and the post-installation component 2, the outer wall of the pre-installation component 1 and the inner wall of the post-installation component 2 are threadedly connected. That is, the outer wall of the pre-installation component 1 is provided with an external thread, and the inner wall of the post-installation component 2 is provided with an internal thread, and the external and internal threads match each other, thereby enabling the pre-installation component 1 and the post-installation component 2 to achieve a threaded connection through the mutual cooperation between the external and internal threads.

[0050] In addition, regardless of whether the thread is set in a forward or reverse direction, in this embodiment, if the rear mounting part 2 can gradually approach the center of the insulating rod body 100 along the axial direction when rotating relative to the pre-mounted part 1, it is the screw-in direction; conversely, if the rear mounting part 2 can gradually move away from the center of the insulating rod body 100 along the axial direction when rotating relative to the pre-mounted part 1, it is the screw-out direction.

[0051] The application scenarios of externally mounted rod-shaped pillar porcelain insulators in this industry are generally divided into two types, namely busbar pillar insulators and disconnect switch insulators. If used as a busbar pillar insulator, its upper and lower ends are fixedly connected to external accessories, so there is no risk of the rear mounting part 2 rotating out of the pre-mounted part 1 and detaching from it during daily use. If the externally mounted rod-shaped pillar porcelain insulator of this embodiment is used as a disconnect switch insulator, due to the repeated opening and closing of the switch accessories on the disconnect switch insulator, there is a risk that the rear mounting part 2 in the insulator will detach from the pre-mounted part 1. Based on this, the improvement of this embodiment is that a locking part is provided between the pre-mounted part 1 and the rear mounting part 2 to limit the circumferential rotation of the rear mounting part 2. As a result, the externally mounted rod-shaped pillar porcelain insulator in this embodiment can be applied to busbar pillar insulators and disconnect switch insulators.

[0052] Based on one of the preferred examples of the locking member in the above embodiment: the locking member is a latch, the side wall of the rear mounting member 2 has a socket for the latch to pass through, and the outer side wall of the pre-mounting member 1 has a countersunk hole;

[0053] When the insertion hole and the subsequent mounting member 2 are rotated to correspond to the countersunk hole, part of the pin is inserted into the countersunk hole through the insertion hole.

[0054] Based on the second preferred example of the locking member in the above embodiment: the locking member is a lock tongue 4, and a mounting groove 5 for accommodating the lock tongue 4 and a slot 6 matching the front end of the lock tongue 4 are respectively provided on the outer side wall of the pre-installation member 1 and the inner side wall of the rear installation member 2, and a thrust spring 7 is provided between the rear end of the lock tongue 4 and the bottom of the mounting groove 5;

[0055] When the rear installation part 2 rotates relative to the pre-installation part 1 until the slot 6 corresponds to the installation slot 5 , the front end of the locking tongue 4 is inserted into the slot 6 under the push of the thrust spring 7 .

[0056] Specifically, if Figure 9 and Figure 11 As shown, the slot 6 is located on the outer side wall of the pre-installed component 1, and the installation slot 5 is located on the inner side wall of the rear-installed component 2. Furthermore, since both the outer side wall of the pre-installed component 1 and the inner side wall of the rear-installed component 2 are provided with threads, the installation slot 5 should include a groove portion formed by radially inwardly cutting the inner side wall of the rear-installed component 2, and also include a cut portion formed by radially outwardly cutting the inner thread on the inner side wall of the installation component 2; at the same time, the slot 6 should include a groove portion formed by radially inwardly cutting the outer side wall of the pre-installed component 1, and also include a cut portion formed by radially outwardly cutting the outer thread on the outer side wall of the pre-installed component 1.

[0057] Of course, the slot 6 in this embodiment may also be provided on the inner wall of the rear installation component 2 , while the installation groove 5 is provided on the outer wall of the pre-installation component 1 .

[0058] Based on the preferred improved solution of the above embodiment, Figure 7-9 As shown, the slot 6 extends axially to form a long strip structure, and the front end of the lock tongue 4 has a front guide surface 8; when the lock tongue 4 rotates relative to the slot 6 along the screw-in direction, the front guide surface 8 abuts against the inner wall of the slot 6, so that the lock tongue 4 retracts and breaks away from the circumferential constraint of the slot 6.

[0059] Take the installation slot 5 located in the rear installation member 2 as an example: the screwing direction in this embodiment is Figure 9 The rear mounting member 2 rotates from left to right. At this time, the side surface and the front end surface of the front end of the lock tongue 4 are inscribed to form a front guide surface 8, which is opposite to the inner wall of the slot 6. When the rear mounting member 2 drives the lock tongue 4 to rotate along the screwing direction, the front guide surface 8 on the lock tongue 4 contacts the inner wall of the slot 6. Under the guidance of the front guide surface 8, the lock tongue 4 is subjected to a reaction force from the slot 6. This reaction force forms a component force in the radial direction to overcome the elastic force of the thrust spring, thereby causing the lock tongue 4 to break away from the constraint of the slot 6 and retract into the mounting slot 5.

[0060] Of course, if the installation groove 5 is located in the pre-installed part 1, the slot 6 is driven to rotate by the rear installation part 2 so that the inner wall of the slot 6 is against the front guide surface 8 on the lock tongue 4 and the missing lock tongue is driven by the reaction force to overcome the thrust spring 7 and retract to the installation groove 5, thereby also achieving normal rotation between the rear installation part 2 and the pre-installed part 1 along the screw-in direction.

[0061] like Figure 9 and Figure 11 As shown, taking the installation slot 5 located in the rear installation part 2 as an example: the slot 6 extends axially to the end surface of the pre-installed part 1 where the slot 6 is located, and the front end of the lock tongue 4 has a rear guide surface 9 on the side facing away from the front guide surface 8. A movable member 10 that slides with the slot 6 is provided between the rear guide surface 9 and the inner wall of the slot 6. One end of the movable member 10 is exposed outside the slot 6, and the movable member 10 has a guide slope 10.1 that matches the rear guide surface 9.

[0062] When the movable part 10 is pulled out of the slot 6 and the lock tongue 4 is rotated in the screw-out direction, the rear guide surface 9 is located in the slot 6, and the rear side surface 4.1 of the lock tongue 4 is against the inner wall of the slot 6; the rear guide surface 9 is located in the slot 6 means that the groove depth from the bottom of the slot along the radial direction to the tooth top position of the external thread on the outer side wall of the pre-installed part 1 is greater than the dimension of the rear guide surface 9 along the slot depth direction, so that when the front end of the lock tongue 4 is inserted into the slot 6, the entire rear guide surface 9 is located in the slot 6.

[0063] When the movable member 10 is inserted between the inner wall of the slot 6 and the lock tongue 4 and the lock tongue 4 rotates in the direction of screwing out, the guide bevel 10.1 on the movable member 10 abuts against the rear guide surface 9 before the inner wall of the slot 6, so that the lock tongue 4 retracts toward the location of the installation slot 5 under the force between the guide surface 9 and the guide bevel 10.1, thereby causing a portion of the rear guide surface 9 on the lock tongue 4 to be exposed outside the slot 6. When the rear guide surface 9 abuts against the inner wall of the slot 6, a reaction force continues to be generated between the rear guide surface 9 and the inner wall of the slot 6, driving the lock tongue 4 to retract, ultimately releasing the lock tongue 4 from the constraint of the slot 6. As a result, the lock tongue 4 can rotate in the direction of screwing out and automatically escape from the slot 6 when the movable member 10 is inserted into the slot 6.

[0064] Of course, if the mounting slot 5 is located in the pre-installed component 1, the slot 6 extends axially to the end surface of the rear mounting component 2 where the slot 6 is located. The front end of the lock tongue 4 has a rear guide surface 9 on the side facing away from the front guide surface 8. A movable member 10 that slides with the slot 6 is provided between the rear guide surface 9 and the inner wall of the slot 6. One end of the movable member 10 is exposed outside the slot 6, and the movable member 10 has a guiding inclined surface 10.1 that matches the rear guide surface 9.

[0065] When the movable part 10 is pulled out of the slot 6 and the lock tongue 4 is rotated in the screw-out direction, the rear guide surface 9 is located in the slot 6 and the side surface of the lock tongue 4 is against the inner wall of the slot 6; the rear guide surface 9 is located in the slot 6 means that the groove depth from the bottom of the slot along the radial direction to the tooth top position of the external thread on the outer side wall of the pre-installed part 1 is greater than the dimension of the rear guide surface 9 along the slot depth direction, so that when the front end of the lock tongue 4 is inserted into the slot 6, the entire rear guide surface 9 is located in the slot 6.

[0066] When the movable member 10 is inserted between the inner wall of the slot 6 and the lock tongue 4 and the lock tongue 4 rotates in the direction of screwing out, the guide bevel 10.1 abuts against the rear guide surface 9 before the inner wall of the slot 6, so that the lock tongue 4 retracts toward the location of the installation slot 5 under the force between the guide surface 9 and the guide bevel 10.1, thereby causing a portion of the rear guide surface 9 on the lock tongue 4 to be exposed outside the slot 6. When the rear guide surface 9 abuts against the inner wall of the slot 6, a reaction force continues to be generated between the rear guide surface 9 and the inner wall of the slot 6, driving the lock tongue 4 to retract, ultimately releasing the lock tongue 4 from the constraint of the slot 6. As a result, the lock tongue 4 can rotate in the direction of screwing out and automatically escape from the slot 6 when the movable member 10 is inserted into the slot 6.

[0067] Based on the improvement of the above embodiment, Figure 8 As shown, there are multiple locking members, and the multiple locking members are evenly distributed along the circumference.

[0068] Preferably, the number of the locking members is two, three, four or six.

[0069] like Figure 4 、 5 As shown in Figures 7 and 8, the inner side wall of the pre-installed part 1 has a plurality of ribs 11 evenly distributed along the circumferential direction, and an arc-shaped groove 12 is formed between any two adjacent ribs 11. The locking members are arranged at positions corresponding to the ribs 11 along the circumferential direction. That is, the number of the locking members is the same as the number of the ribs 11, or the number of the locking members and the number of the ribs 11 is less than the number of the ribs 11, and each locking member is connected to its corresponding rib 11 along the circumferential direction. Figure 8 Radial spacing settings shown.

[0070] Based on the embodiment in which the locking member is a locking tongue and the slot 6 has a movable member 10 that can be inserted or removed, when there are multiple locking members, in order to replace the rear installation member 2, it is necessary to insert the movable member 10 into each slot 6 respectively so that the rear installation member 2 can be rotated in the screw-out direction until it is screwed out. Obviously, inserting multiple movable members 10 into each slot 6 one by one is time-consuming and labor-intensive. Based on this, the improvement of this embodiment is: Figure 13 As shown, each slot 6 is provided with a movable part 10, and the bottom of the movable part 10 has a hand-held end 13 exposed outside the slot 6. The hand-held end 13 of each movable part 10 is sequentially connected along the circumferential direction to form an integrated annular structure, and a notch 13.1 is provided on the hand-held end 13 of the annular structure. A bending point 13.2 is provided on the hand-held end 13 of the annular structure at a position away from the notch 13.1 in the horizontal direction. The part of the hand-held end 13 of the annular structure located at the bending point 13.2 is made of elastic material, so that the hand-held end 13 of the annular structure can bend around the bending point 13.2 to expand the notch 13.1 or reset to a size of the notch 13.1 under the action of its own elastic reset force.

[0071] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

[0072] Various changes and modifications will undoubtedly become apparent to those skilled in the art upon reading the foregoing description. Therefore, the appended claims should be construed to encompass all changes and modifications within the true intent and scope of the present invention. Any and all equivalents within the scope of the claims should be considered to be within the intent and scope of the present invention.

Claims

1. An externally-mounted rod-shaped post porcelain insulator, comprising an insulating rod body (100), wherein the end of the insulating rod body (100) is provided with a connecting accessory (200), characterized in that: The connection accessory (200) comprises: A pre-installed component (1) is sleeved outside the end of the insulating rod (100) and fixedly connected to the insulating rod (100); A rear installation component (2) is sleeved outside the pre-installation component (1) and is connected to the pre-installation component (1) in a detachable manner; The end of the rear mounting member (2) facing away from the insulating rod body (100) has a connecting end (3) for connecting to an external accessory; The outer side wall of the pre-installed part (1) and the inner side wall of the post-installed part (2) are threadedly connected; A locking member for limiting circumferential rotation of the rear mounting member (2) is provided between the pre-mounting member (1) and the rear mounting member (2); The locking member is a lock tongue (4), and a mounting groove (5) for accommodating the lock tongue (4) and a slot (6) matching the front end of the lock tongue (4) are respectively provided on the outer side wall of the pre-installed member (1) and the inner side wall of the rear-installed member (2), and a thrust spring (7) is provided between the rear end of the lock tongue (4) and the bottom of the mounting groove (5); When the rear mounting member (2) is rotated relative to the pre-mounting member (1) until the slot (6) corresponds to the mounting slot (5), the front end of the locking tongue (4) is inserted into the slot (6) under the push of the thrust spring (7); The slot (6) extends axially to form a long strip structure, and the front end of the lock tongue (4) has a front guide surface (8); when the lock tongue (4) rotates relative to the slot (6) in the screw-in direction, the front guide surface (8) abuts against the inner wall of the slot (6), so that the lock tongue (4) retracts and escapes from the circumferential constraint of the slot (6); The slot (6) extends axially to the end face of the rear mounting part (2) or pre-mounting part (1) where the slot (6) is located, and the front end of the lock tongue (4) has a rear guide surface (9) on the side facing away from the front guide surface (8). A movable part (10) that slides with the slot (6) is provided between the rear guide surface (9) and the inner wall of the slot (6). One end of the movable part (10) is exposed outside the slot (6), and the movable part (10) has a guide inclined surface (10.1) that matches the rear guide surface (9). When the lock tongue (4) rotates in the screw-out direction and the movable member (10) is pulled out of the slot (6), the rear guide surface (9) is located in the slot (6) and the side surface of the lock tongue (4) abuts against the inner wall of the slot (6); When the lock tongue (4) rotates in the screw-out direction and the movable member (10) is inserted between the inner wall of the slot (6) and the lock tongue (4), the guide inclined surface (10.1) abuts against the rear guide surface (9) before the inner wall of the slot (6), so that part of the rear guide surface (9) is exposed outside the slot (6).

2. The externally-molded rod-shaped post porcelain insulator according to claim 1, characterized in that: There are multiple locking pieces, and the multiple locking pieces are evenly distributed along the circumferential direction.

3. The externally-molded rod-shaped post porcelain insulator according to claim 2, characterized in that: There are four locking pieces.

4. The externally-molded rod-shaped post porcelain insulator according to claim 1, characterized in that: The inner side wall of the pre-installed component (1) has a plurality of ribs (11) uniformly distributed along the circumferential direction, an arc-shaped groove (12) is formed between any two adjacent ribs (11), and the locking component is arranged at a position corresponding to the ribs (11) along the circumferential direction.

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