A pole-mounted transformer mounting structure

Abstract

The application discloses a pole-mounted transformer mounting structure and relates to the technical field of power facilities and equipment.The application comprises a first electric pole, a first mounting rack, a lifting assembly and a carrying assembly, a second electric pole is arranged on the side of the first electric pole, the first mounting rack is arranged on the same side of the first electric pole and the second electric pole, the second mounting rack is mounted on the outer wall of the first electric pole and the second electric pole on the opposite side of the first mounting rack, the lifting assembly is mounted on the first mounting rack and the second mounting rack on the opposite side of the transformer assembly, and the carrying assembly is mounted on the outer wall of the first electric pole and the second electric pole below the first mounting rack and the second mounting rack.The application realizes the effect of automatically lifting the transformer assembly by the lifting assembly, the carrying assembly bears the transformer assembly lifted to a specified height, and the two oppositely arranged mounting racks form a triangular structure, which is stable, and when one end of the triangular structure slips off, the other end still has the effect of clamping and limiting.

Description

Technical Field

[0001] This invention belongs to the field of power facility equipment technology, and in particular relates to a pole-mounted transformer installation structure. Background Technology

[0002] Electricity is indispensable for production and daily life in all walks of life, leading to an ever-increasing demand for electricity. This has resulted in a growing burden on power facilities and equipment. Among these facilities and equipment, transformers are one of the most common and important. Transformers are generally divided into indoor and outdoor types. Outdoor transformers can be further divided into ground-mounted and suspended transformers. Different types of transformers are selected based on the actual environmental conditions. Suspended transformers require a special installation structure to be mounted on a transformer column to ensure the stability of the transformer and prevent it from falling off.

[0003] Existing publicly available literature, CN112837903A, discloses a transformer installation structure. This structure includes a support frame located between two utility poles. A transformer and a comprehensive distribution box are mounted on the support frame. The transformer is located above the comprehensive distribution box. A lifting plate is fixed to the side of the comprehensive distribution box facing the utility poles. Lifting angle steel is provided on the upper side of the support frame, and the lifting angle steel is connected to the lifting plate by lifting bolts. Two parallel mounting channel steels are fixed to the side wall of the comprehensive distribution box facing the support frame, and two positioning channel steels are fixed to the side wall of the transformer facing the support frame. The two positioning channel steels are located on opposite sides of the support frame, and the mounting channel steels and positioning channel steels are connected by tie bolts. This application reduces the installation difficulty of the transformer and comprehensive distribution box, while improving their installation stability and reducing safety hazards.

[0004] However, CN112837903A - a transformer installation structure mentioned above has the following shortcomings in actual use:

[0005] 1. One of the transformer installation structures described above includes a lifting mechanism powered by a motor. The motor drives a lifting screw to rotate, which in turn moves the sliding block's sliding groove along its height, thus moving the support channel steel to the installation height. The support channel steel then rises to its final installation position under the influence of the connecting rod. Because this transformer installation structure is for outdoor use, it does not consider the motor's rainproof, moisture-proof, and dustproof performance, resulting in a significant impact of the surrounding environment on the motor's performance. Furthermore, the motor is electrically driven and directly mounted around the transformer, with close proximity to other motors, posing a potential safety hazard during operation.

[0006] 2. In one of the above-mentioned transformer installation structures, a snap-fit ​​mechanism is used to mount the lifting mechanism and the transformer. After the transformer is assembled, the snap-fit ​​mechanism provides support for the transformer and the lifting mechanism. The transformer and the lifting mechanisms on both sides are supported only by the snap-fit ​​mechanism, which results in poor stability. Furthermore, the transformer is not only large in size but also heavy in weight, which further increases the support burden on the snap-fit ​​mechanism.

[0007] 3. In one of the above-mentioned transformer installation structures, the distribution box is mounted at the bottom of the transformer. When routine maintenance and repair work is required on either the transformer or the distribution box, both devices will rise or fall synchronously, and they cannot be adjusted independently during maintenance. Summary of the Invention

[0008] The purpose of this invention is to provide a pole-mounted transformer mounting structure. By utilizing a lifting component, the transformer assembly is automatically lifted. The mounting component supports the transformer assembly raised to a specified height. The triangular structure formed by two opposing mounting brackets not only provides strong stability but also ensures that the other end remains engaged and limited even when one end slips, preventing direct fall. This solves the problems encountered in CN112837903A - A Transformer Mounting Structure.

[0009] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0010] This invention relates to a pole-mounted transformer mounting structure, comprising a first pole, a first mounting frame, a lifting assembly, and a mounting assembly. A second pole is disposed beside the first pole. The first mounting frame is disposed on the same side of the first and second poles. A second mounting frame is mounted on the outer wall of the first and second poles opposite to the first mounting frame. A transformer assembly is mounted in the upper side wall of the first and second mounting frames near the second pole. The lifting assembly is mounted on the first and second mounting frames opposite to the transformer assembly. The mounting assembly is mounted on the outer wall of the first and second poles below the first and second mounting frames.

[0011] Furthermore, both the first and second power poles are provided with a column head at the top and a column base at the bottom. Both the first and second power poles are provided with mounting grooves on their outer walls, and mounting limiting holes are provided on the inner top wall of the mounting grooves. Specifically, the structure of the mounting limiting holes is the same as the structure of the built-in plate in the mounting assembly.

[0012] Furthermore, toothed grooves are provided on the outer walls of the front and rear sides of the first electrical post, and ball bearing grooves are provided on the outer wall of the second electrical post. There are two toothed grooves in total, and the two toothed grooves are symmetrically arranged with each other. There are four ball bearing grooves in total, and the four ball bearing grooves are arranged in a circular array. Specifically, the inner wall of the toothed grooves is engaged with the gear in the lifting assembly.

[0013] Furthermore, the first mounting bracket and the second mounting bracket have the same structure. The difference between the first mounting bracket and the second mounting bracket is that the mounting plate on the first two-part circular plate is positioned on the top, while the mounting plate on the second mounting bracket is positioned on the bottom. The two mounting plates are stacked on top of each other. The first mounting bracket has a lifting groove in the upper and lower side walls near the first quarter circular plate. A matching drive groove is provided on the inner side wall of the first mounting bracket next to the lifting groove. The lifting groove is T-shaped and is connected to the motor box through a lifting plate.

[0014] Furthermore, a first quarter circular plate is welded to one end of the first mounting bracket, and a first two-quarter circular plate is welded to the other end of the first mounting bracket. A water leakage groove is provided inside the first two-quarter circular plate, and a mounting plate is welded to the outer wall of the first two-quarter circular plate. The two mounting plates are connected by mounting bolts, and a second quarter circular plate is provided on the side of the first quarter circular plate.

[0015] Furthermore, one end of the first two-part circular plate on the first mounting bracket and one end of the second two-part circular plate on the second mounting bracket are connected by a mounting shaft, and the other end of the first two-part circular plate and the second two-part circular plate are connected by mounting studs. Ball bearings are embedded on the inner sidewalls of both the first two-part circular plate and the second two-part circular plate.

[0016] Furthermore, the transformer assembly includes a transformer body, with heat sinks snapped onto the front and rear outer walls of the transformer body, and the transformer body is snapped onto the limiting frame via the heat sinks.

[0017] Furthermore, a drive motor is installed in the motor box of the lifting assembly. The drive motor shaft is connected to the linkage groove wheel for synchronous rotation via a linkage chain. The linkage groove wheel is connected to the linkage gear via a mating rod, and a mating bearing is sleeved in the middle of the mating rod. Specifically, the linkage groove wheel is located inside the mating drive groove, and the mating rod is rotatably connected to the first and second mounting brackets of the mating bearing. That is, the mating rod is embedded inside the first and second mounting brackets, and the mating rod extends through the mounting brackets into the toothed groove of the power post.

[0018] Furthermore, the bottom of the motor housing is connected to the base plate by bolts, a dustproof plate is embedded in the center of the base plate, and a top cover is installed in the upper side wall of the motor housing, with hanging plates snapped on both ends of the top cover.

[0019] Furthermore, an internal post is welded to the inner wall of the first mounting ring in the mounting assembly. The two end sidewalls of the first mounting ring are connected to the two end sidewalls of the second mounting ring by mounting pins. An internal groove is provided at the center of the internal post and at the center of the second mounting ring. An internal plate passes through the inside of the internal groove. A mounting ring is welded to the outer wall of the internal plate.

[0020] The present invention has the following beneficial effects:

[0021] 1. This invention, by setting up a lifting assembly, allows the drive motor within the lifting assembly to be housed inside a motor housing during use. Ventilation and heat dissipation are achieved through a dustproof plate at the bottom, effectively preventing dust from entering and protecting the internal drive motor from excessive contact with the external environment. This also assists in heat dissipation. Furthermore, the entire lifting assembly is installed on a utility pole opposite the transformer, with a considerable distance between them to avoid interference. On the other side of the lifting assembly, the inner wall of the mounting bracket abuts against a ball bearing groove on the outer wall of the utility pole via ball bearings, providing auxiliary lifting. This invention solves the problems of the aforementioned transformer installation structure by adding a lifting mechanism. The structure, in which the lifting mechanism is powered by a motor, drives the lifting screw to rotate, which in turn moves the sliding block in the sliding groove in the vertical direction, thus moving the support channel steel to the installation height. The support channel steel then rises to the final installation position under the action of the connecting rod. Because the transformer installation structure is for outdoor use, it does not take into account the rainproof, moisture-proof, and dustproof performance of the motor, resulting in a significant impact of the surrounding environment on the performance of the motor. At the same time, the motor is powered by electricity and is directly mounted around the transformer with close proximity to each other, which poses a certain risk of motor operation hazard.

[0022] 2. This invention, through the setting of a mounting component, consists of a first mounting ring and a second mounting ring that are symmetrically arranged. The two mounting rings form a ring that fits onto the power post. During use, the assembled rings are held in place by a Y-shaped insulating rod and raised to the top of the mounting groove. The mounting rings are rotated by the Y-shaped insulating rod, and then one end of the Y-shaped insulating rod is inserted into the mounting ring and pressed inward. At this time, the inner plate is inserted into the mounting limiting hole of the power post due to the pressing force, thus fixing the mounting component in this position to support the first mounting frame, the second mounting frame, and the transformer assembly on them. This solves the problem of the above-mentioned transformer mounting structure, which uses a snap-fit ​​mechanism to mount the lifting mechanism and the transformer. After the transformer is assembled, the snap-fit ​​mechanism only supports the transformer and the lifting mechanism. The transformer and the lifting mechanisms on both sides are supported only by the snap-fit ​​mechanism, which has poor stability. The transformer is not only large in size but also heavy in weight, which further increases the support burden on the snap-fit ​​mechanism.

[0023] 3. This invention, by setting up a first pole, a second pole, a first mounting bracket, and a second mounting bracket, provides excellent stability. When one end slips off, the other end remains secured to the pole, preventing immediate fall and providing time for repairs, thus avoiding direct damage to the equipment. Furthermore, the distribution box can be installed directly on the outer wall or inside the pole using conventional assembly methods, separating it from the mounting bracket. This solves the problem in one transformer installation structure where the distribution box is mounted at the bottom of the transformer, causing both devices to rise or fall simultaneously during routine maintenance and repairs, and making individual adjustment impossible during maintenance. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A schematic diagram of a pole-mounted transformer mounting structure;

[0026] Figure 2 This is a schematic diagram of the structure of the first power pole;

[0027] Figure 3 This is a schematic diagram of the second power pole.

[0028] Figure 4 A schematic diagram of the structure of the first mounting frame, the second mounting frame, the transformer assembly, and the lifting assembly;

[0029] Figure 5 This is a structural disassembly diagram of the first mounting bracket, the second mounting bracket, the transformer assembly, and the lifting assembly.

[0030] Figure 6 This is a structural disassembly diagram of a transformer assembly;

[0031] Figure 7 A structural disassembly diagram of the lifting component;

[0032] Figure 8 This is a structural disassembly diagram of the components.

[0033] The attached diagram lists the components represented by each number as follows:

[0034] 1. First post; 101. Post head; 102. Post base; 103. Mounting groove; 1031. Mounting limiting hole; 104. Toothed groove; 2. Second post; 201. Ball bearing groove; 3. First mounting bracket; 301. First quarter-circular plate; 302. First two-quarter-circular plate; 3021. Drain groove; 3022. Mounting bolt; 303. Mounting plate; 304. Mounting shaft; 305. Second two-quarter-circular plate; 306. Mounting stud; 307. Ball bearing; 308. Second quarter-circular plate; 309. Lifting groove; 3010. Mating drive groove; 4. Second mounting bracket; 5. Transformer assembly Components; 501, Transformer body; 502, Heat sink; 503, Limiting frame; 6, Lifting assembly; 601, Motor housing; 602, Base plate; 603, Dustproof plate; 604, Hanging plate; 605, Top cover; 606, Drive motor; 607, Linkage chain; 608, Linkage grooved wheel; 609, Matching rotating rod; 6010, Matching gear; 6011, Matching bearing; 7, Mounting assembly; 701, First mounting retaining ring; 7011, Internal column; 702, Second mounting retaining ring; 7021, Internal groove; 703, Mounting pin; 704, Internal plate; 7041, Mounting ring. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0036] Example 1

[0037] Please see Figures 1 to 8 As shown, the present invention is a pole-mounted transformer mounting structure, including a first pole 1, a first mounting frame 3, a lifting assembly 6, and a mounting assembly 7. A second pole 2 is arranged beside the first pole 1. The first mounting frame 3 is arranged on the same side of the first pole 1 and the second pole 2. A second mounting frame 4 is installed on the outer wall of the first pole 1 and the second pole 2 on the opposite side of the first mounting frame 3. A transformer assembly 5 is installed in the upper side wall of the first mounting frame 3 and the second mounting frame 4 near the end of the second pole 2. The lifting assembly 6 is installed on the first mounting frame 3 and the second mounting frame 4 on the opposite side of the transformer assembly 5. The mounting assembly 7 is installed on the outer wall of the first pole 1 and the second pole 2 below the first mounting frame 3 and the second mounting frame 4.

[0038] Please see Figures 1 to 3As shown, both the first and second power posts 1 and 2 are provided with a column head 101 at the top and a column base 102 at the bottom. Both the first and second power posts 1 and 2 have mounting grooves 103 on their outer walls and mounting limiting holes 1031 on the inner top wall of the mounting grooves 103. The front and rear outer walls of the first power post 1 are provided with toothed grooves 104, and the outer wall of the second power post 2 is provided with ball bearing grooves 201. There are two toothed grooves 104, which are symmetrically arranged between each other. There are four ball bearing grooves 201, which are arranged in a circular array. Specifically, the inner wall of the toothed groove 104 is meshed with the gear 6010 in the lifting assembly 6.

[0039] Please see Figures 4 to 5 As shown, the first mounting bracket 3 and the second mounting bracket 4 have the same structure. The difference between the first mounting bracket 3 and the second mounting bracket 4 lies in the mounting plate 303 on the first bisecting circular plate 302. The mounting plate 303 on the first mounting bracket 3 is located on the upper part, while the mounting plate 303 on the second mounting bracket 4 is located on the lower part. The two mounting plates 303 are stacked on top of each other. The first mounting bracket 3 has a lifting groove 309 in the upper and lower side walls near the first quartering circular plate 301, and a mating drive groove 3010 is provided on the inner side wall of the first mounting bracket 3 next to the lifting groove 309. The first quartering circular plate 301 is welded to one end of the first mounting bracket 3, and the other end of the first mounting bracket 3 is welded to... There is a first two-part circular plate 302, and a water leakage groove 3021 is opened inside the first two-part circular plate 302. An installation plate 303 is welded to the outer wall of the first two-part circular plate 302. The two installation plates 303 are connected by installation bolts 3022. A second four-part circular plate 308 is provided on the side of the first four-part circular plate 301. One end of the first two-part circular plate 302 on the first mounting frame 3 and the second two-part circular plate 305 on the second mounting frame 4 are connected by an installation shaft 304, and the other end of the first two-part circular plate 302 and the second two-part circular plate 305 are connected by an installation stud 306. Ball bearings 307 are embedded on the inner sidewalls of the first two-part circular plate 302 and the second two-part circular plate 305.

[0040] Please see Figure 4 and 6 As shown, the transformer assembly 5 includes a transformer body 501. Heat sinks 502 are snapped onto the outer walls of the front and rear sides of the transformer body 501. The transformer body 501 is snapped onto the limiting frame 503 through the heat sinks 502.

[0041] Please see Figure 4 and 7As shown, a drive motor 606 is installed in the motor housing 601 of the lifting assembly 6. The shaft of the drive motor 606 is synchronously connected to the linkage wheel 608 via a linkage chain 607. The linkage wheel 608 is connected to the gear 6010 via a mating rod 609, and a mating bearing 6011 is sleeved in the middle of the mating rod 609. Specifically, the linkage wheel 608 is located inside the mating drive groove 3010, and the mating rod 609 is rotatably connected to the first mounting bracket 3 and the second mounting bracket 4 via the mating bearing 6011. That is, the mating rod 609 is embedded inside the first mounting bracket 3 and the second mounting bracket 4, and the mating rod 609 extends through the mounting bracket into the toothed groove 104 of the power post. The bottom of the motor housing 601 is connected to the base plate 602 by bolts. A dustproof plate 603 is embedded in the center of the base plate 602. A top cover 605 is installed in the upper side wall of the motor housing 601, and hanging plates 604 are snapped onto both ends of the top cover 605.

[0042] Please see Figure 4 and 8 As shown, an inner post 7011 is welded into the inner wall of the first mounting ring 701 in the mounting assembly 7. The two end side walls of the first mounting ring 701 are connected to the two end side walls of the second mounting ring 702 by mounting pins 703. An inner groove 7021 is provided at the center of the inner post 7011 and the center of the second mounting ring 702. An inner plate 704 passes through the inner groove 7021. A mounting ring 7041 is welded onto the outer wall of the inner plate 704.

[0043] Example 2

[0044] Based on the pole-mounted transformer installation structure described in Embodiment 1, during use, the drive motor 606 in the lifting assembly 6 is housed inside the motor housing 601, and ventilation and heat dissipation are achieved through the bottom dustproof plate 603. This not only effectively prevents dust from entering and protects the internal drive motor 606 from excessive contact with the external environment, but also provides auxiliary heat dissipation. Furthermore, the entire lifting assembly 6 is installed on the pole opposite to the transformer assembly 5, with a considerable distance between them to avoid interference. On the other side of the lifting assembly 6, the inner wall of the mounting bracket abuts against the ball bearing groove 201 on the outer wall of the pole via ball bearings 307, providing an auxiliary lifting effect. When the drive motor 606 in the lifting assembly 6 is working, the linkage effect of the linkage chain 607, the linkage pulley 608, and the cooperating rotating rod 609 allows the cooperating gear 6010 to roll up and down within the tooth groove 104. This achieves the effect of raising the first mounting bracket 3 and the second mounting bracket 4 at one end, while the bottom of the other end is supported by a human-assisted support rod, thereby assisting the drive motor 606 on the opposite side; the mounting component 7 is composed of a first mounting ring 701 and a second mounting ring 702 that are symmetrical to each other, and the two mounting rings form a ring that is fitted onto the power post. Then, the assembled ring is held in place by a Y-shaped insulating rod and raised to the top of the mounting groove 103. The mounting ring assembly is rotated by the Y-shaped insulating rod, and then one end of the Y-shaped insulating rod is inserted into the mounting ring 7041 and then pressed inward. At that time, the built-in plate 704 will be inserted into the mounting limiting hole 1031 of the power post due to the pressing force, thus fixing the mounting component 7 in this position to support the first mounting bracket 3, the second mounting bracket 4 and the transformer assembly 5 on them.

[0045] The above are merely preferred embodiments of the present invention and do not limit the present invention. Any modifications, equivalent substitutions, or improvements made to the technical solutions described in the foregoing embodiments, or to some of the technical features, shall fall within the protection scope of the present invention.

Claims

1. A pole-mounted transformer mounting structure, comprising a first pole (1), a first mounting bracket (3), a lifting assembly (6), and a mounting assembly (7), characterized in that: A second pole (2) is provided on the side of the first pole (1). A first mounting bracket (3) is provided on the same side of the first pole (1) and the second pole (2). A second mounting bracket (4) is installed on the outer wall of the first pole (1) and the second pole (2) on the opposite side of the first mounting bracket (3). A transformer assembly (5) is installed in the upper side wall of the first mounting bracket (3) and the second mounting bracket (4) near the end of the second pole (2). A lifting assembly (6) is installed on the first mounting bracket (3) and the second mounting bracket (4) on the opposite side of the transformer assembly (5). A mounting assembly (7) is installed on the outer wall of the first pole (1) and the second pole (2) below the first mounting bracket (3) and the second mounting bracket (4). The first wire post (1) has toothed grooves (104) on its front and rear outer walls, and the second wire post (2) has ball bearing grooves (201) on its outer wall. There are two toothed grooves (104) in total, and the two toothed grooves (104) are symmetrically arranged with each other. There are four ball bearing grooves (201) in total, and the four ball bearing grooves (201) are arranged in a ring array. The first mounting bracket (3) and the second mounting bracket (4) have the same structure. The difference between the first mounting bracket (3) and the second mounting bracket (4) is that the mounting plate (303) on the first bisecting circular plate (302) is located on the top, while the mounting plate (303) on the second mounting bracket (4) is located on the bottom. The two mounting plates (303) are stacked on top of each other. The first mounting bracket (3) has a hoisting groove (309) in the upper and lower side walls near the first quartering circular plate (301), and a mating drive groove (3010) is provided on the inner side wall of the first mounting bracket (3) next to the hoisting groove (309). A first quarter circular plate (301) is welded to one end of the first mounting bracket (3), and a first two-part circular plate (302) is welded to the other end of the first mounting bracket (3). A water leakage groove (3021) is provided inside the first two-part circular plate (302). A mounting plate (303) is welded to the outer wall of the first two-part circular plate (302). The two mounting plates (303) are connected by mounting bolts (3022). A second quarter circular plate (308) is provided on the side of the first quarter circular plate (301). One end of the first two-part circular plate (302) on the first mounting bracket (3) and the second two-part circular plate (305) on the second mounting bracket (4) are connected by a mounting shaft (304), and the other end of the first two-part circular plate (302) and the second two-part circular plate (305) are connected by a mounting stud (306). The inner sidewalls of the first two-part circular plate (302) and the second two-part circular plate (305) are inlaid with balls (307).

2. The pole-mounted transformer mounting structure as described in claim 1, characterized in that: The first power post (1) and the second power post (2) are each provided with a column head (101) at the top, and the first power post (1) and the second power post (2) are each provided with a column base (102) at the bottom. The first power post (1) and the second power post (2) are each provided with a mounting groove (103) on the outer wall, and the mounting groove (103) is provided with a mounting limiting hole (1031) on the top inner wall.

3. The pole-mounted transformer mounting structure as described in claim 1, characterized in that: The transformer assembly (5) includes a transformer body (501), and heat sinks (502) are snapped onto the outer walls of the front and rear sides of the transformer body (501). The transformer body (501) is snapped onto the limiting frame (503) through the heat sinks (502).

4. The pole-mounted transformer mounting structure as described in claim 1, characterized in that: The lifting assembly (6) has a drive motor (606) installed in the motor box (601). The shaft of the drive motor (606) is connected to the linkage wheel (608) through the linkage chain (607) for synchronous rotation. The linkage wheel (608) is connected to the linkage gear (6010) through the mating rod (609), and the mating bearing (6011) is sleeved in the middle of the mating rod (609).

5. The pole-mounted transformer mounting structure as described in claim 4, characterized in that: The bottom of the motor housing (601) is connected to the base plate (602) by bolts. A dustproof plate (603) is embedded in the center of the base plate (602). A top cover (605) is installed in the upper side wall of the motor housing (601). Hanging plates (604) are snapped at both ends of the top cover (605).

6. The pole-mounted transformer mounting structure as described in claim 1, characterized in that: The inner wall of the first mounting ring (701) in the mounting assembly (7) is welded with an internal post (7011). The two end sidewalls of the first mounting ring (701) are connected to the two end sidewalls of the second mounting ring (702) by mounting pins (703). An internal groove (7021) is provided at the center of the internal post (7011) and at the center of the second mounting ring (702). An internal plate (704) is inserted inside the internal groove (7021). A mounting ring (7041) is welded on the outer side wall of the internal plate (704).

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