Flat cable connector

Abstract

The utility model relates to the technical field of power equipment, and discloses a flat cable connector which comprises a butt joint seat, a butt joint head, a first pipe body, a second pipe body and a cable pressure plate assembly, the butt joint head and the butt joint seat are connected in an inserted mode to be used for transmitting signals between cables, and the second pipe body is arranged on the periphery of the butt joint seat and the butt joint in a sleeving mode. The first pipe body is connected to one end, far away from the butt joint, of the second pipe body, the first pipe body is provided with a flat square cable interface far away from the second pipe body, the cable interface is used for embedding a flat cable, and the cable pressure plate assembly is connected to the first pipe body and is used for fixing the flat cable. The cable interface is in a flat square shape so that the flat cable can be embedded conveniently, the cable pressing disc assembly is connected to the first pipe body, relative fixation of the first pipe body and the flat cable is achieved, the possibility that the flat cable is disengaged in the using process is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electric power equipment, and in particular to a flat cable connector. Background Art

[0002] Cable connectors are mainly used for signal transmission between various digital program-controlled switches in transmission equipment bureaus, internal connections of optoelectronic transmission equipment and distribution frames, and are used to transmit data, audio, video and other communication equipment.

[0003] The thin coal seam mining machine has a narrow working surface and low mining height. At the same time, the machine has to move back and forth, which will cause the traditional round power supply cable used by the coal mining machine to bend and fold back and forth, and it is easy to wear and break. Therefore, the industry uses flat cables (i.e. cables with a flat square cross-section) as a replacement, because the thickness of flat cables with the same current carrying capacity is nearly half of the outer diameter of traditional round cables, and the bending radius of round cables is generally 4 times its thickness, while that of flat cables is 2.5 times. When the space above and below the working surface is relatively narrow, flat cables can better adapt to the situation of reciprocating bending and folding in a limited space. The use of flat cables has indeed solved the problem of cable damage when using round cables in the existing technology.

[0004] Currently, the lead-in interfaces of cable connectors are mostly round cable lead-in interfaces, but the round cable lead-in interfaces cannot be adapted to the shape of flat cables. Utility Model Content

[0005] In order to meet the connection requirements of a flat cable, the present application provides a flat cable connector.

[0006] The flat cable connector provided in this application adopts the following technical solution:

[0007] A flat cable connector comprises a docking seat, a docking head, a first tube body, a second tube body and a cable pressure plate assembly, wherein the docking head and the docking seat are plugged together to transmit signals between cables, the second tube body is sleeved on the outer circumference of the docking seat and the docking head, the first tube body is connected to an end of the second tube body away from the docking head, the first tube body is provided with a flat square cable interface away from the second tube body, the cable interface is used for the flat cable to be embedded, and the cable pressure plate assembly is connected to the first tube body and is used to fix the flat cable.

[0008] By adopting the above technical solution, the cable interface is a flat square shape, which is convenient for the flat cable to be embedded. The cable pressure plate assembly is connected to the first tube body to achieve relative fixation of the first tube body and the flat cable, reducing the possibility of the flat cable detaching during use and improving work efficiency.

[0009] Preferably, it also includes a cable sealing assembly, wherein a first embedding groove is provided on the inner wall of the cable interface away from one end of the second tube body, and the cable sealing assembly includes a first sealing ring in a flat square shape, the first sealing ring is embedded in the first embedding groove, and the inner wall of the first sealing ring is used to press against the outer wall of the flat cable.

[0010] By adopting the above technical solution, the inner wall of the first sealing ring is used to press against the outer wall of the flat cable, thereby improving the sealing performance between the flat cable and the first box body, reducing the possibility of external liquid entering the first tube body, reducing the possibility of the connection between the docking seat and the flat cable being exposed to water, and improving the service life of the device.

[0011] Preferably, the cable pressure plate assembly includes a pressure block, one end of which is embedded in the first groove and pressed against the end of the first sealing ring away from the second tube body, the pressure block is provided with a first through hole, the first through hole is used for the flat cable to pass through, the outer periphery of the pressure block is connected with a first abutment ring, the first abutment ring abuts against the end of the first tube body away from the second tube body, the first abutment ring is provided with a first mounting hole, the first mounting hole is used for a bolt to pass through and then be threadedly connected to the first tube body.

[0012] By adopting the above technical solution, the pressing block squeezes the first sealing ring, causing the first sealing ring to deform, and the inner wall of the first sealing ring presses against the outer wall of the flat cable, thereby improving the sealing performance between the first sealing ring and the flat cable. The bolt passes through the first mounting hole and is threadedly connected to the first tube body, thereby achieving relative fixation of the flat cable and the first tube body.

[0013] Preferably, the cable pressure plate assembly further comprises a pressure plate, the pressure block is provided with a fixing groove, the pressure plate is embedded in the fixing groove, and the pressure plate and the first through hole wall are pressed tightly against the outer wall of the flat cable.

[0014] By adopting the above technical solution, the outer wall of the flat cable is abutted by the pressing plate, so that the outer wall of the flat cable is pressed tightly against the wall of the first through hole, thereby further fixing the flat cable and improving the stability of the connection between the connector and the flat cable.

[0015] Preferably, the fixing groove is located at an end of the pressing block away from the first sealing ring.

[0016] By adopting the above technical solution, the fixing groove is located at the end of the pressing block away from the first sealing ring, which facilitates the connection and disassembly of the pressing plate and the pressing block.

[0017] Preferably, a plurality of weight-reducing grooves are provided on the outer circumference of the pressing block, and the plurality of weight-reducing grooves are distributed at intervals along the circumference of the pressing block.

[0018] By adopting the above technical solution and setting the weight-reducing groove, the weight of the pressing block can be reduced while meeting the strength requirements.

[0019] Preferably, it also includes a fusion box, which includes a box body and a box cover, the box body is connected to the periphery of the first tube body, the box body is provided with a fusion cavity, the inner wall of the first tube body is provided with a connecting hole, the connecting hole is connected to the fusion cavity, the box cover is connected to the box body and covers the fusion cavity opening, the side wall of the box body is provided with a wiring hole, the wiring hole is connected to the fusion cavity, and the wiring hole is used for embedding optical fibers.

[0020] By adopting the above technical solution, the connecting hole is used for the optical fiber in the flat cable to extend into the fusion cavity, and the box cover and the box body are detachably connected, so it is convenient to remove the box cover to fuse the optical fiber in the fusion cavity.

[0021] Preferably, it also includes a fiber optic sealing assembly and a fiber optic pressure plate assembly, a second embedding groove is provided on the inner wall of the wiring hole away from one end of the box body, the fiber optic sealing assembly includes a second sealing ring, the second sealing ring is embedded in the second embedding groove, the inner wall of the second sealing ring is used to press against the outer wall of the optical fiber, and the fiber optic pressure plate assembly is embedded in the second embedding groove and used to fix the optical fiber.

[0022] By adopting the above technical solution, the inner wall of the second sealing ring is used to press against the outer wall of the optical fiber to prevent external liquid from entering the fusion cavity or the first tube body, thereby improving the service life of the device. The optical fiber pressure plate assembly is used to achieve relative fixation of the optical fiber and the fusion box, reducing the possibility of random movement of the optical fiber.

[0023] Preferably, the optical fiber pressure plate assembly includes an abutment block, which is threadedly connected to the second groove, one end of the abutment block abuts against an end of the second sealing ring away from the box body, the abutment block is provided with a second through hole, the second through hole is used for the optical fiber to pass through, and a second abutment ring is connected to the outer periphery of the abutment block.

[0024] By adopting the above technical solution, the abutment block is threadedly connected to the second embedding groove, and the end of the abutment block away from the second sealing ring is connected to the second abutment ring, which facilitates the installation and disassembly of the abutment block and improves work efficiency.

[0025] Preferably, a second fillet is provided on a hole wall at one end of the second through hole away from the second sealing ring.

[0026] By adopting the above technical solution, the rounded corner guides the optical fiber, making it easier for the optical fiber to be embedded in the second through hole.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. The cable interface is a flat square shape, which is convenient for the flat cable to be embedded. The cable pressure plate assembly is connected to the first tube body to achieve relative fixation between the first tube body and the flat cable, reducing the possibility of the flat cable being separated during use and improving work efficiency;

[0029] 2. The pressing block squeezes the first sealing ring to deform the first sealing ring, and the inner wall of the first sealing ring presses against the outer wall of the flat cable to improve the sealing performance between the first sealing ring and the flat cable. The bolt passes through the first mounting hole and is threadedly connected with the first tube body to achieve relative fixation of the flat cable and the first tube body.

[0030] 3. The outer wall of the flat cable is pressed against the pressure plate, so that the outer wall of the flat cable is pressed against the wall of the first through hole, thereby further fixing the flat cable and improving the stability of the connection between the connector and the flat cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a cross-sectional view of a flat cable connector.

[0032] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0033] Figure 3 It is a schematic diagram of the structure of a flat cable connector.

[0034] Figure 4 yes Figure 1 Enlarged view of point B in the middle.

[0035] Description of reference numerals:

[0036] 1. Connector housing; 11. First tube body; 111. Cable interface; 112. First embedding groove; 113. Communication hole; 114. First fixing hole; 12. Second tube body; 121. Second annular groove; 13. Third tube body; 131. First annular groove; 14. Welding box; 141. Box body; 1411. Welding cavity; 1412. Wiring hole; 1413. Second embedding groove; 1414. Third fixing hole; 142. Box cover; 1421. Third annular groove; 1422. Third mounting hole; 1423. Retaining ring;

[0037] 2. Docking station;

[0038] 3. Butt joint;

[0039] 4. Cable pressure plate assembly; 41. Pressure block; 411. First through hole; 412. Fixing groove; 413. Weight reduction groove; 414. First fillet; 415. Second fixing hole; 42. Pressure plate; 421. Connecting block; 4211. Second mounting hole; 43. First abutting ring; 431. First mounting hole;

[0040] 5. Cable sealing assembly; 51. First sealing ring;

[0041] 6. Optical fiber pressure plate assembly; 61. Abutment block; 611. Second through hole; 612. Second fillet; 62. Second abutment ring;

[0042] 7. Optical fiber sealing assembly; 71. Second sealing ring. DETAILED DESCRIPTION

[0043] The present application is further described in detail below in conjunction with the accompanying drawings.

[0044] Reference Figure 1 The embodiment of the present application discloses a flat cable connector including a connector housing 1, a docking seat 2 and a docking head 3. The connector housing 1 includes a first tube body 11, a second tube body 12 and a third tube body 13. Two groups of cables are fixedly connected to the docking seat 2 and the docking head 3, respectively. After the docking head 3 is plugged and fixed to the docking seat 2, the docking seat 2 and the docking head 3 can transmit the signal of the cable assembly. The third tube body 13 is sleeved on the outer periphery of the docking head 3 and the docking seat 2, and the inner wall of the third tube body 13 fits with the outer wall of the docking head 3. The second tube body 12 is coaxially fixedly connected to one end of the third fixed body close to the docking seat 2, and a first annular groove 131 is provided on the inner wall of one end of the third tube body 13 close to the docking seat 2, and one end of the second tube body 12 close to the docking head 3 is embedded in the first annular groove 131, and the inner wall of the second tube body 12 fits with the outer wall of the docking seat 2. The first tube body 11 is coaxially fixedly connected to one end of the second tube body 12 away from the third tube body 13. A second annular groove 121 is provided on the inner periphery of one end of the second tube body 12 away from the docking joint 3. One end of the first tube body 11 close to the second tube body 12 is embedded in the second annular groove 121. One end of the first tube body 11 extending into the second annular groove 121 abuts against one end of the docking seat 2 away from the docking joint 3.

[0045] Reference Figure 1 and Figure 2 , a flat cable connector also includes a cable sealing assembly 5. A flat square cable interface 111 is provided at one end of the first tube body 11 away from the docking seat 2, and the cable interface 111 is used for the flat cable to be embedded. The cable sealing assembly 5 includes a flat square first sealing ring 51. A first embedding groove 112 is provided at the inner wall of the end of the cable interface 111 away from the docking seat 2, and the first embedding groove 112 is annular. The first sealing ring 51 is embedded in the first embedding groove 112. The end of the first sealing ring 51 close to the docking seat 2 abuts against the bottom of the first embedding groove 112, and the outer wall of the first sealing ring 51 fits against the side wall of the first embedding groove 112. The inner wall of the first sealing ring 51 is used to press against the outer wall of the flat cable. In this embodiment, the first sealing ring 51 is made of flame-retardant silicone.

[0046] Reference Figure 2 and Figure 3A flat cable connector also includes a cable pressure plate assembly 4. The cable pressure plate assembly 4 is connected to the first tube body 11 and is used to fix the flat cable. The cable pressure plate assembly 4 includes a pressure block 41. One end of the pressure block 41 is embedded in the first embedding groove 112, and there is a gap between the side wall of the pressure block 41 and the groove wall of the first embedding groove 112. The end of the pressure block 41 extending into the first embedding groove 112 squeezes the end of the first sealing ring 51 away from the bottom of the first embedding groove 112. The pressure block 41 is provided with a first through hole 411, and the first through hole 411 is flat and square. The hole wall of the first through hole 411 away from the first sealing ring 51 is provided with a first fillet 414. The flat cable passes through the first through hole 411, the first sealing ring 51 and the cable interface 111 in sequence and then extends into the first tube body 11. The outer periphery of the pressing block 41 is connected with a first abutting ring 43, and the first abutting ring 43 is provided with a plurality of first mounting holes 431, and the plurality of first mounting holes 431 are distributed at intervals along the circumference of the first abutting ring 43. In the present embodiment, the first abutting ring 43 is in a flat square shape, and four first mounting holes 431 are provided, and the four first mounting holes 431 are located at the four corners of the first abutting ring 43. The first tube body 11 is provided with first fixing holes 114, and the number of the first fixing holes 114 is the same as the number of the first mounting holes 431 and corresponds one to one. The bolt passes through the first mounting hole 431 and is threadedly connected with the first fixing hole 114. The outer periphery of the pressing block 41 is provided with a plurality of weight-reducing grooves 413, and the plurality of weight-reducing grooves 413 are distributed at intervals along the circumference of the pressing block 41. The weight-reducing groove 413 is located on the side of the first abutting ring 43 close to the first sealing ring 51. In the present embodiment, four weight-reducing grooves 413 are provided.

[0047] The cable pressure plate assembly 4 also includes a pressure plate 42. A fixing groove 412 is provided on the outer periphery of the pressure block 41 away from the end of the first sealing ring 51. The fixing groove 412 is connected to the first through hole 411. The pressure plate 42 is embedded in the fixing groove 412. The length direction of the pressure plate 42 is perpendicular to the axial direction of the first tube body 11. Two connecting blocks 421 are connected to the two ends of the pressure plate 42 along the length direction of the pressure plate 42. The connecting blocks 421 fit the bottom of the fixing groove 412. The pressure plate 42 and the wall of the first through hole 411 are pressed against the outer wall of the flat cable. The connecting block 421 is provided with a second mounting hole 4211. The bottom of the fixing groove 412 is provided with a second fixing hole 415. The bolt passes through the second mounting hole 4211 and is threadedly connected to the second fixing hole 415.

[0048] Reference Figure 1 and Figure 4 The connector housing 1 also includes a welding box 14. The welding box 14 includes a box body 141 and a box cover 142. The box body 141 is fixedly connected to the outer wall of the first tube body 11, and the box body 141 is located on the side of the pressing plate 42 away from the bottom of the fixing groove 412. A welding cavity 1411 is provided on the side of the box body 141 away from the first tube body 11, and the box cover 142 is fixedly connected to the box body 141 and covers the cavity opening of the welding cavity 1411. A third annular groove 1421 is provided on the side of the box cover 142 facing the box body 141, and the third annular groove 1421 is used for embedding a sealing member.

[0049] Reference Figure 3 , the box cover 142 is provided with a plurality of third mounting holes 1422, and the plurality of third mounting holes 1422 are spaced apart along the circumference of the box cover 142. In this embodiment, there are four third mounting holes 1422, and the four third mounting holes 1422 are located at the four corners of the box cover 142. The end of the box body 141 close to the box cover 142 is provided with third fixing holes 1414, and the number of the third fixing holes 1414 is the same as the number of the third mounting holes 1422 and corresponds one to one. The bolts pass through the third mounting holes 1422 and are threadedly connected with the third fixing holes 1414. A retaining ring 1423 is connected to the side of the box cover 142 away from the box body 141, and the retaining ring 1423 is arranged around the mounting hole, and the number of the retaining ring 1423 is the same as the number of the third mounting holes 1422 and corresponds one to one.

[0050] Reference Figure 1 and Figure 4 , a flat cable connector also includes an optical fiber sealing assembly 7. A connecting hole 113 is provided on the inner wall of the first tube body 11, and the connecting hole 113 is connected to the bottom of the fusion cavity 1411. A wiring hole 1412 is provided at the cavity wall of the fusion cavity 1411 away from the second tube body 12, and the wiring hole 1412 is connected to the outside. A second embedding groove 1413 is provided at the hole wall of the wiring hole 1412 away from the side of the fusion cavity 1411, and the second embedding groove 1413 is annular. The optical fiber sealing assembly 7 includes a second sealing ring 71. The second sealing ring 71 is embedded in the second embedding groove 1413, and one end of the second sealing ring 71 close to the fusion cavity 1411 abuts against the bottom of the second embedding groove 1413, and the outer wall of the second sealing ring 71 is in contact with the groove wall of the second embedding groove 1413. The inner wall of the second sealing ring 71 is used to press against the outer wall of the optical fiber. In this embodiment, the second sealing ring 71 is made of flame-retardant silicone.

[0051] A flat cable connector also includes an optical fiber pressure plate assembly 6. The optical fiber pressure plate assembly 6 is embedded in the second embedding groove 1413 and is used to fix the optical fiber. The optical fiber pressure plate assembly 6 includes an abutment block 61. One end of the abutment block 61 is coaxially threadedly connected to the second embedding groove 1413. The end of the abutment block 61 that extends into the second embedding groove 1413 squeezes the end of the second sealing ring 71 away from the bottom of the second embedding groove 1413. The abutment block 61 is provided with a second through hole 611. The hole wall of the second through hole 611 away from the second sealing ring 71 is provided with a second fillet 612. The optical fiber passes through the second through hole 611, the second sealing ring 71 and the wiring hole 1412 in sequence and then extends into the fusion cavity 1411. The optical fiber is used to fuse with the optical fiber in the flat cable. A second abutment ring 62 is fixedly connected to the outer wall of the abutment block 61 away from the second sealing ring 71. In this embodiment, the second abutment ring 62 is hexagonal.

[0052] The implementation principle of a flat cable connector in an embodiment of the present application is as follows: the flat cable passes through the first through hole 411, the first sealing ring 51 and the cable interface 111 in sequence and then extends into the first tube body 11, the flat cable is connected to the docking seat 2, the docking seat 2 is plugged into the docking head 3, and then connected to the other end of the cable through the docking head 3 to realize signal transmission of the cable.

[0053] The pressing block 41 slides toward the side close to the second tube body 12, squeezing the first sealing ring 51, causing the first sealing ring 51 to deform, and the inner wall of the first sealing ring 51 presses against the outer wall of the flat cable. When the first abutting ring 43 abuts against the first tube body 11, the bolt passes through the first mounting hole 431 and is threadedly connected to the first tube body 11, thereby achieving relative fixation of the pressing block 41 and the first tube body 11. The pressing plate 42 presses against the outer wall of the flat cable, so that the outer wall of the flat cable away from the pressing plate 42 fits against the wall of the first through hole 411. The bolt passes through the second mounting hole 4211 and is threadedly connected to the pressing block 41, thereby achieving relative fixation of the pressing plate 42 and the pressing block 41 and clamping the flat cable.

[0054] The optical fiber passes through the second through hole 611, the second sealing ring 71 and the wiring hole 1412 in sequence and then extends into the fusion cavity 1411. The optical fiber is fused with the optical fiber in the flat cable to transmit the signal to the external device. The abutment block 61 is threadedly connected in the second embedding groove 1413, and the abutment block 61 squeezes the second sealing ring 71, the second sealing ring 71 is deformed, and the inner wall of the second sealing ring 71 is pressed against the outer wall of the optical fiber.

[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A flat cable connector, Features: The invention comprises a docking seat (2), a docking head (3), a first tube body (11), a second tube body (12) and a cable pressure plate assembly (4); the docking head (3) and the docking seat (2) are plugged together to transmit signals between cables; the second tube body (12) is sleeved on the outer circumference of the docking seat (2) and the docking head (3); the first tube body (11) is connected to an end of the second tube body (12) away from the docking head (3); the first tube body (11) is provided with a flat square cable interface (111) away from the second tube body (12); the cable interface (111) is used for inserting a flat cable; the cable pressure plate assembly (4) is connected to the first tube body (11) and is used for fixing the flat cable.

2. The flat cable connector according to claim 1, Features: It also comprises a cable sealing assembly (5); a first embedding groove (112) is provided on the inner wall of the cable interface (111) at one end away from the second tube body (12); the cable sealing assembly (5) comprises a first sealing ring (51) in a flat square shape; the first sealing ring (51) is embedded in the first embedding groove (112); the inner wall of the first sealing ring (51) is used to press against the outer wall of the flat cable.

3. The flat cable connector according to claim 2, Features: The cable pressure plate assembly (4) comprises a pressure block (41); one end of the pressure block (41) is embedded in the first embedding groove (112) and pressed against the end of the first sealing ring (51) away from the second tube body (12); the pressure block (41) is provided with a first through hole (411); the first through hole (411) is used for allowing the flat cable to pass through; the outer periphery of the pressure block (41) is connected with a first abutment ring (43); the first abutment ring (43) abuts against the end of the first tube body (11) away from the second tube body (12); the first abutment ring (43) is provided with a first mounting hole (431); the first mounting hole (431) is used for allowing a bolt to pass through and then be threadedly connected to the first tube body (11).

4. The flat cable connector according to claim 3, Features: The cable pressure plate assembly (4) further comprises a pressure plate (42); the pressure block (41) is provided with a fixing groove (412); the pressure plate (42) is embedded in the fixing groove (412); the pressure plate (42) and the wall of the first through hole (411) are pressed tightly against the outer wall of the flat cable.

5. The flat cable connector according to claim 4, Features: The fixing groove (412) is located at an end of the pressing block (41) away from the first sealing ring (51).

6. The flat cable connector according to claim 3, Features: A plurality of weight-reducing grooves (413) are provided on the outer circumference of the pressing block (41); the plurality of weight-reducing grooves (413) are distributed at intervals along the circumference of the pressing block (41).

7. The flat cable connector according to claim 1, Features: It also comprises a fusion box (14); the fusion box (14) comprises a box body (141) and a box cover (142); the box body (141) is connected to the outer periphery of the first tube body (11); the box body (141) is provided with a fusion cavity (1411); the inner wall of the first tube body (11) is provided with a communication hole (113); the communication hole (113) is connected to the fusion cavity (1411); the box cover (142) is connected to the box body (141) and covers the cavity opening of the fusion cavity (1411); a wiring hole (1412) is provided on the side wall of the box body (141); the wiring hole (1412) is connected to the fusion cavity (1411); the wiring hole (1412) is used for embedding optical fibers.

8. The flat cable connector according to claim 7, Features: It also comprises an optical fiber sealing assembly (7) and an optical fiber pressure plate assembly (6); a second embedding groove (1413) is provided at the inner wall of the wiring hole (1412) at one end away from the box body (141); the optical fiber sealing assembly (7) comprises a second sealing ring (71); the second sealing ring (71) is embedded in the second embedding groove (1413); the inner wall of the second sealing ring (71) is used to press against the outer wall of the optical fiber; the optical fiber pressure plate assembly (6) is embedded in the second embedding groove (1413) and is used to fix the optical fiber.

9. The flat cable connector according to claim 8, Features: The optical fiber pressure plate assembly (6) comprises an abutment block (61); the abutment block (61) is threadedly connected to the second embedding groove (1413); one end of the abutment block (61) abuts against an end of the second sealing ring (71) away from the box body (141); the abutment block (61) is provided with a second through hole (611); the second through hole (611) is used for allowing the optical fiber to pass through; and a second abutment ring (62) is connected to the outer periphery of the abutment block (61).

10. The flat cable connector according to claim 9, Features: A second rounded corner (612) is provided on the hole wall of one end of the second through hole (611) away from the second sealing ring (71).

Images