A sealing device for a planetary mechanism liquid hole joint surface of a coal mining machine

Abstract

This application relates to the field of coal mining machines, and more particularly to a sealing device for the interface of a liquid passage in a planetary mechanism of a coal mining machine. The device includes placement grooves formed on the inner walls of water holes and oil holes. A single main body is disposed within the placement grooves on the inner walls of the water holes and oil holes. A first sealing ring is embedded in the side wall of the main body. The first sealing ring abuts and seals against the inner wall of the water hole and also against the inner wall of the oil hole. This application has the effect of reducing the machining difficulty of the sealing structure on the internal gear ring and bearing housing.

Description

Technical Field

[0001] This application relates to the field of coal mining machines, and in particular to a sealing device for the liquid passage joint surface of a planetary mechanism of a coal mining machine. Background Technology

[0002] Reference Figure 1 and Figure 2 The planetary mechanism of the coal mining machine rocker arm includes a bearing housing 1 and an internal gear ring 11. The planetary mechanism requires cooling water to flow through the bearing housing 1 and lubricating oil to flow through the internal gear ring 11 for forced lubrication. Therefore, the bearing housing has a water hole 12 for cooling water, and the internal gear ring has an oil hole 13 for lubricating oil, with the water hole 12 and oil hole 13 connected. The internal gear ring 11 is pressed against the bearing housing 1 by a cylindrical pin and bolts; therefore, the joint between the inner walls of the water hole 12 and the oil hole 13 needs to be effectively sealed.

[0003] Using end face axial sealing requires machining sealing grooves on the inner gear ring 11 and the side wall of the bearing housing 1. Sealing is achieved through the contact fit between the sealing grooves. This sealing groove requires high machining precision, which results in a long machining time. Summary of the Invention

[0004] To address the issue of long processing time due to the high difficulty in machining the sealing ring groove, this application provides a sealing device for the mating surface of the liquid passage hole in the planetary mechanism of a coal mining machine.

[0005] This application provides a sealing device for the liquid passage joint surface of a planetary mechanism of a coal mining machine, which adopts the following technical solution:

[0006] A sealing device for the liquid passage joint surface of a planetary mechanism of a coal mining machine includes a placement groove formed on the inner wall of a water hole and an oil hole. The same main body is provided in the placement groove on the inner wall of the water hole and the oil hole. A first sealing ring is embedded on the side wall of the main body. The first sealing ring abuts and seals against the inner wall of the water hole and also abuts and seals against the inner wall of the oil hole.

[0007] By adopting the above technical solution, when the main body is inserted into the placement groove, the first sealing ring is squeezed against the inner wall of the placement groove and the side wall of the main body. After deformation, the first sealing ring abuts against the inner wall of the placement groove and the side wall of the main body, achieving the purpose of sealing. When the liquid in the water hole and oil hole flows, if the liquid wants to leak out from the gap between the bearing seat and the internal gear ring, since the same main body is installed between the water hole and the oil hole, the gap between the bearing seat and the internal gear ring is covered by the main body, making it difficult for the liquid to leak out directly from the gap between the bearing seat and the internal gear ring. When the liquid wants to leak out from the gap between the side wall of the main body and the inner wall of the water hole to the gap between the bearing seat and the internal gear ring, since the first sealing ring abuts and squeezes against the inner wall of the placement groove and the inner wall of the main body, the gap between the side wall of the main body and the water hole is sealed. The seal between the inner walls prevents liquid from leaking from the gap between the main body side wall and the inner wall of the water hole to the gap between the bearing housing and the internal gear ring. When liquid tries to leak from the gap between the main body side wall and the inner wall of the oil hole to the gap between the bearing housing and the internal gear ring, the first sealing ring simultaneously presses against the inner wall of the placement groove and the inner wall of the main body, achieving a seal between the main body side wall and the inner wall of the oil hole, making it difficult for liquid to leak from the gap between the main body side wall and the inner wall of the oil hole to the gap between the bearing housing and the internal gear ring. Therefore, it plays a sealing role between the bearing housing and the internal gear ring. Only a placement groove needs to be machined on the bearing housing and the internal gear ring. Due to the elasticity of the first sealing ring, high precision is not required during production, which greatly reduces the processing difficulty and processing time.

[0008] Optionally, a second sealing ring is embedded in the side wall of the bearing housing, and the second sealing ring abuts and seals against the side wall of the internal gear ring.

[0009] By adopting the above technical solution, the second sealing ring simultaneously abuts against the side wall of the bearing housing and the side wall of the inner gear ring, and the gap between the side wall of the bearing housing and the side wall of the inner gear ring is sealed through deformation and extrusion, which further plays a sealing role and reduces the probability of liquid leakage from the water hole and oil hole.

[0010] Optionally, a limiting annular groove is formed on the main body for placing and limiting the first sealing ring.

[0011] By adopting the above technical solution, the limiting ring groove provides space for the sliding and deformation of the first sealing ring. If the side wall of the main body fits well with the inner wall of the placement groove, the first sealing ring can deform within the limiting ring groove. This reduces the probability that when the dimensions of the main body and the cross-sectional dimensions of the placement groove are exactly the same, the main body will be difficult to place into the placement groove due to the lack of space for the deformation of the first sealing ring. This makes it easier to place the main body into the placement groove and increases the fitting range between the main body and the placement groove, thereby reducing the precision required for processing, further reducing the processing difficulty, and improving processing efficiency.

[0012] Optionally, a spring sheet for compressing the first sealing ring is provided on the inner wall of the limiting ring groove.

[0013] By adopting the above technical solution, the first sealing ring is compressed by the spring sheet, allowing it to deform more outward from the limiting ring groove. This greater deformation results in greater pressure against the inner wall of the limiting ring groove and the inner wall of the placement groove, further improving the sealing effect of the first sealing ring. Furthermore, even when there is a significant difference between the dimensions of the main body and the cross-sectional dimensions of the placement groove, the first sealing ring can still deform under the compression of the spring sheet and press against the inner wall of the placement groove, achieving a seal between the inner wall of the placement groove and the side wall of the main body. This expands the fit range between the main body and the placement groove, increases the allowable range of errors caused by tool wear or other factors during processing, further reduces processing difficulty, and improves processing efficiency.

[0014] Optionally, an abutment groove is provided on the inner wall of the limiting ring groove, and an abutment member for abutting against the spring sheet to compress the first sealing ring is slidable in the abutment groove. The main body is provided with a control component for controlling the sliding of the abutment member.

[0015] By adopting the above technical solution, the contact element is controlled by the control component, and the contact element pushes the spring piece towards the first sealing ring, thereby increasing the force of the spring piece pushing the first sealing ring and making the active deformation of the first sealing ring controllable. After the main body is inserted into the placement groove, the first sealing ring can be deformed by the control component. When the first sealing ring deforms and contacts the inner wall of the placement groove, the main body is stabilized in the placement groove, and the adjustment is completed, further improving the adaptation range.

[0016] Optionally, the abutting member includes an abutting ring plate that abuts against the spring sheet and an abutting ring block disposed on the abutting ring plate. The control component includes a control ring that rotates on the side wall of the main body. The control ring and the abutting ring block are threadedly connected. A limit groove is formed on the inner wall of the abutting groove. A limit block for inserting and sliding in the limit groove is provided on the abutting ring block.

[0017] By adopting the above technical solution, the sliding direction of the contact ring block in the contact groove is limited by the limiting block and the limiting groove. When the control ring rotates, the thread on the control ring will drive the contact ring block to rotate. Under the limiting action of the limiting block and the limiting groove, the contact ring block is difficult to rotate and can only slide. Therefore, the force of rotation is transformed into the force of sliding, thus realizing the control of the spring piece. In addition, the threaded connection also has a self-locking performance, which makes it difficult for the contact ring block to slide in the opposite direction when the inner wall of the placement groove abuts against the first sealing ring to provide a reaction force, thereby reducing the pressure of the spring piece on the first sealing ring and improving the stability of the first sealing ring and the spring piece.

[0018] Optionally, the main body is provided with a clearance ring groove for making way for the control ring, and a pull strap is hinged to the control ring.

[0019] By adopting the above technical solution, the control ring is placed in the groove, which keeps the outer sidewall of the main body flat. This reduces the probability that the control ring will affect the process of placing the main body in the groove, making the installation of the main body in the groove smoother. Furthermore, the control ring can be rotated by pulling the pull belt. The pull belt is equivalent to extending the lever arm, which saves effort and makes it easier and less strenuous to rotate the control ring.

[0020] Optionally, the clearance ring groove includes a control groove and a fixing groove, the control groove and the fixing groove are connected by a connecting groove, the control groove is connected to the abutting groove, the control ring includes a control threaded ring that rotates in the control groove and a fixing ring that rotates in the fixing groove, a connecting ring is provided between the control threaded ring and the fixing ring, and the control threaded ring is threadedly connected to the abutting ring block.

[0021] By adopting the above technical solution, the main body sidewall between the fixed groove and the control groove is sandwiched in the middle by the fixed ring and the control ring, making the state of the control ring more stable and the contact between the control ring and the abutting ring block more stable. This reduces the probability of the control ring shifting due to external forces, resulting in uneven contact force between one inner wall of the control ring and the abutting ring block, and uneven force between the other inner wall of the control ring and the abutting ring block. This makes the force on the abutting ring block more even, and the force that the control ring needs to overcome unevenly, increasing the probability of the rotation process being unsmooth and difficult. This solution makes the force on the abutting ring block more even, and the rotation process of the control ring smoother, thus facilitating operation.

[0022] Optionally, a triangular groove is provided on the inner wall of the fixing groove, a triangular plug is provided on the pull strap for insertion into the triangular groove, and a through groove is provided on the fixing ring for the triangular plug to pass through.

[0023] By adopting the above technical solution, when the triangular plug is just inserted into the triangular groove, that is, only a small part of the side wall of the triangular plug is in contact with the inner wall of the triangular groove. At this time, the pull strap is pulled closer to the main body. During the pulling process, the triangular plug is gradually inserted into the triangular groove under the guidance of its own side wall and the inclined direction of the inner wall of the triangular groove. After it is fully inserted, the snap-fit ​​fixation between the main body and the fixing ring is completed. At this time, after the bearing seat and the internal gear ring are closed, the pull strap will abut against the inner wall of the placement groove, making it difficult for the triangular plug to be removed from the triangular groove. This ensures the fit between the triangular plug and the triangular groove and improves the stability of the snap-fit ​​fixation between the main body and the fixing ring.

[0024] Optionally, the pull strap is further provided with a block, and the fixing ring is provided with a square groove for the block to be inserted and limited, and the triangular insert is located between the block and the hinge of the pull strap.

[0025] By adopting the above technical solution, after the triangular insert is inserted into the triangular groove, the pull belt can be controlled to insert the square block into the square groove to fix the pull belt. At this time, the bearing seat and the internal gear ring can be covered, so that the main body is completely installed in the placement groove, which reduces the probability of the triangular insert coming out of the triangular groove during the covering process of the bearing seat and the internal gear ring, and improves the stability of the pull belt.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. It provides a seal between the bearing housing and the internal gear ring, and does not require high precision during production, which greatly reduces the difficulty and time of processing.

[0028] 2. The sealing effect has been improved, the allowable range of error has been expanded, and the compatibility range has been increased. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the bearing housing and the internal gear ring.

[0030] Figure 2 It is along Figure 1 A cross-sectional view of line AA in the middle.

[0031] Figure 3 This is a cross-sectional schematic diagram of a sealing device for the liquid passage joint surface of a planetary mechanism of a coal mining machine according to Embodiment 1 of this application.

[0032] Figure 4 This is a schematic diagram of the main structure.

[0033] Figure 5 This is a schematic diagram of the main body in Embodiment 2 of this application.

[0034] Figure 6 It is along Figure 5 A cross-sectional view of the BB line.

[0035] Figure 7 yes Figure 6 A magnified structural diagram at point C.

[0036] Figure 8 This is a schematic diagram of the exploded structure highlighting the triangular groove.

[0037] Explanation of reference numerals in the attached drawings: 1. Bearing housing; 11. Internal gear ring; 12. Water hole; 13. Oil hole; 2. Placement groove; 21. Main body; 22. First sealing ring; 23. Second sealing ring; 24. Limiting ring groove; 25. Spring piece; 3. Abutment groove; 31. Abutment element; 32. Abutment ring piece; 33. Abutment ring block; 34. Limiting groove; 35. Limiting block; 4. Control assembly; 41. Control ring; 411. Relief ring groove; 42. Pull belt; 421. Pull belt relief groove; 43. Control groove; 44. Fixing groove; 45. Connecting groove; 5. Control threaded ring; 51. Fixing ring; 52. Connecting ring; 6. Triangular groove; 61. Triangular insert; 62. Through groove; 63. Square block; 64. Square groove. Detailed Implementation

[0038] The following, in conjunction with Appendices 1-8, provides a further detailed description of this application.

[0039] Embodiment 1 of this application discloses a sealing device for the mating surface of the liquid passage hole in the planetary mechanism of a coal mining machine. (Refer to...) Figure 3 The sealing device for the liquid passage joint surface of the planetary mechanism of the coal mining machine includes a placement groove 2 formed on the inner wall of the water hole and the oil hole. The water hole and the oil hole correspond to each other, and the opening diameter of the water hole is equal to the opening diameter of the oil hole. The water hole and the oil hole are connected. The same main body 21 is engaged in the placement groove 2 formed on the inner wall of the water hole and the inner wall of the oil hole. In this embodiment, the main body 21 is in the shape of a hollow annular column. The placement groove 2 formed on the inner wall of the water hole and the inner wall of the oil hole are connected. The outer wall of the main body 21 abuts against and fits against the inner wall of the placement groove 2.

[0040] Reference Figure 4 The main body 21 has two limiting annular grooves 24, located at both ends of the main body 21 and within the water hole and oil hole, respectively. The limiting annular grooves 24 extend circumferentially along the main body 21. A first sealing ring 22 is embedded within each limiting annular groove 24, fitting against the inner wall of the groove. The diameter of the first sealing ring 22 is larger than the depth of the limiting annular groove 24. The first sealing ring 22 within the water hole presses against the inner wall of the water hole to achieve a seal, and the first sealing ring 22 within the oil hole presses against the inner wall of the oil hole to achieve a seal.

[0041] Reference Figure 3 A second sealing ring 23 is also embedded on the side wall of the bearing housing facing the inner gear ring. The second sealing ring 23 extends circumferentially along the bearing housing, and the side wall of the second sealing ring 23 abuts and presses against the side wall of the inner gear ring facing the bearing housing to achieve a seal.

[0042] The implementation principle of the sealing device for the liquid passage joint surface of the planetary mechanism of a coal mining machine according to the embodiment of this application is as follows: When it is necessary to combine the bearing housing and the internal gear ring, the main body 21 can be placed into the placement groove 2 first, and then the bearing housing can be covered on the internal gear ring. At this time, the liquid flowing in the water hole and the oil hole flows through the main body 21. If the liquid flows into the gap between the side wall of the main body 21 and the inner wall of the water hole, it will be sealed and blocked by the first sealing ring 22. If the liquid flows into the gap between the side wall of the main body 21 and the inner wall of the oil hole, it will be sealed and blocked by another first sealing ring 22, so that the liquid can only flow through the main body 21, and the machining precision requirements of the placement groove 2 are low.

[0043] Example 2:

[0044] Unlike Example 1, referring to Figure 5 and Figure 6 Each inner wall of the limiting ring groove 24 facing each other is fixedly connected with a spring piece 25 for compressing the first sealing ring 22. In this embodiment, the spring piece 25 is made of rubber material and extends around the opening direction of the limiting ring groove 24. Two spring pieces 25 in one limiting ring groove 24 are clamped on both sides of the first sealing ring 22.

[0045] Reference Figure 6 Each of the two limiting ring grooves 24 has an abutment groove 3 on its inner wall, which is close to each other. The abutment grooves 3 on the inner walls of the two limiting ring grooves 24 extend in the direction of approaching each other. The spring piece 25 is fixedly connected to the inner wall of the limiting ring groove 24 on both sides of the opening surface of the abutment groove 3, and the spring piece 25 covers the opening surface of the abutment groove 3. An abutment member 31 for abutting against the side wall of the spring piece 25 slides in the abutment groove 3. The abutment member 31 abuts against the side wall of the opening surface of the abutment groove 3 that the spring piece 25 covers. The abutment member 31 slides out of the abutment groove 3 to abut the spring piece 25 to compress the first sealing ring 22. A control component 4 for controlling the sliding of the abutment member 31 is also installed on the main body 21.

[0046] Reference Figure 6 and Figure 7 The abutting member 31 includes an abutting ring 32 that abuts against the spring piece 25 and an abutting ring block 33 fixedly connected to the abutting ring 32. The abutting ring 32 is located outside the abutting groove 3, and the width of the abutting ring 32 is greater than the width of the opening surface of the abutting groove 3. The abutting ring 32 is used to abut against the side wall of the spring piece 25. The control assembly 4 includes a control ring 41 that rotates on the outer ring side wall of the main body 21. A clearance ring groove 411 is provided on the outer ring side wall of the main body 21 to make way for the control ring 41.

[0047] Reference Figure 7The clearance ring groove 411 includes a control groove 43 and a fixing groove 44. A connecting groove 45 connects the control groove 43 and the fixing groove 44. The control groove 43 is connected to the abutting groove 3, and the two abutting grooves 3 connect from both sides of the control groove 43 into the same control groove 43. The control groove 43 is circumferentially formed within the main body 21. The fixing groove 44 is formed on the outer side wall of the main body 21, and the fixing groove 44 also extends circumferentially. The opening of the fixing groove 44 is located on the side wall of the main body 21 between the two placement grooves 2. The cross-sectional dimensions of the fixing groove 44 and the control groove 43 are both larger than the cross-sectional dimensions of the connecting groove 45.

[0048] Reference Figure 7 The control ring 41 includes a control threaded ring 5 that rotates within the control groove 43 and a fixed ring 51 that rotates within the fixed groove 44. A connecting ring 52 is fixedly connected between the control threaded ring 5 and the fixed ring 51. The sidewall of the control threaded ring 5 is in contact with the inner wall of the control groove 43, and the control threaded ring 5 is threadedly connected to the abutment ring block 33. Both abutment ring blocks 33 have threads on their outer sidewalls facing the control threaded ring 5. The threads on the two abutment ring blocks 33 rotate in opposite directions, and the two abutment ring blocks 33 are threadedly connected to the same sidewall of the control threaded ring 5. The control threaded ring 5 has forward threads and reverse threads on its inner sidewalls facing the abutment ring blocks 33. The forward threads and reverse threads are threadedly connected to the threads on the two abutment ring blocks 33, respectively. Rotation of the control threaded ring 5 simultaneously drives the two abutment ring blocks 33 to slide in directions away from or towards each other.

[0049] Reference Figure 7 The thickness of the fixing ring 51 is equal to the depth of the fixing groove 44 to ensure the flatness of the outer wall of the main body 21. The side wall of the fixing ring 51 abuts against the inner wall of the fixing groove 44, while the connecting ring 52 rotates in the connecting groove 45, and the side wall of the connecting ring 52 abuts against the inner wall of the connecting groove 45. The cross-sectional dimensions of the fixing ring 51 and the control thread ring 5 are larger than the cross-sectional dimensions of the connecting ring 52.

[0050] Reference Figure 7 A limiting groove 34 is provided on the inner wall of the contact groove 3. The limiting groove 34 extends along the sliding direction of the contact ring block 33. A limiting block 35 for inserting and sliding in the limiting groove 34 is fixedly connected to the side wall of the contact ring block 33 facing away from the control threaded ring 5. The side wall of the limiting block 35 abuts and fits against the inner wall of the limiting groove 34.

[0051] Reference Figure 7A pull strap clearance groove 421 is provided on the outer sidewall of the fixing ring 51. The pull strap clearance groove 421 extends circumferentially along the outer sidewall of the fixing ring 51, and a pull strap 42 is hinged to the inner wall of the pull strap clearance groove 421. The thickness of the pull strap 42 is less than the depth of the pull strap clearance groove 421. In this embodiment, the pull strap 42 is made of flexible metal, and the width of the pull strap 42 is less than the width of the cross-section of the pull strap clearance groove 421.

[0052] Reference Figure 5 and Figure 8 The fixing groove 44 has several triangular grooves 6 on its inner wall facing its opening. These triangular grooves 6 are evenly distributed along the length of the fixing groove 44, and the inner wall of each triangular groove 6 is triangular in shape. A triangular insert 61 for insertion into the triangular groove 6 is fixedly connected to the side wall of the pull strap 42 facing the inner wall of the fixing groove 44. The triangular insert 61 is located near the hinge of the pull strap 42 and is triangular in shape. The triangular insert 61 fits into the triangular groove 6, and the outer wall of the triangular insert 61 abuts against the inner wall of the triangular groove 6. A through groove 62 for the triangular insert 61 to pass through is provided on the fixing ring 51.

[0053] Reference Figure 5 and Figure 8 A square block 63 is fixedly connected to the side wall of the pull strap 42 facing the inner wall of the fixing groove 44. The square block 63 is located at the end of the pull strap 42 away from its hinge point and is square in shape. A square groove 64 for inserting and limiting the square block 63 is provided on the side wall of the fixing ring 51 facing the opening of the fixing groove 44. The square groove 64 is located on the inner wall of the pull strap clearance groove 421 near the hinge point of the pull strap 42. The square groove 64 is adapted to the square block 63, and the side wall of the square block 63 abuts against and fits against the inner wall of the square groove 64. A triangular insert 61 is located between the hinge point of the square block 63 and the pull strap 42.

[0054] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sealing device for the mating surface of the liquid passage hole in the planetary mechanism of a coal mining machine, characterized in that: The device includes placement grooves (2) formed on the inner walls of water holes and oil holes. A single main body (21) is installed within the placement grooves (2) on the inner walls of the water holes and oil holes. A first sealing ring (22) is embedded in the side wall of the main body (21). One of the first sealing rings (22) abuts and seals against the inner wall of the water hole, and the other first sealing ring (22) abuts and seals against the inner wall of the oil hole. A limiting ring groove (24) is formed on the main body (21) for placing and limiting the first sealing ring (22). A spring piece (25) for pressing the first sealing ring (22) is provided on the inner wall of the limiting ring groove (24). An abutting groove (3) is formed on the inner wall of the limiting ring groove (24). An abutting member for abutting against the spring piece (25) to press the first sealing ring (22) slides within the abutting groove (3). (31) The main body (21) is provided with a control component (4) for controlling the sliding of the contact member (31). The contact member (31) includes a contact ring (32) that abuts against the spring sheet (25) and a contact ring block (33) provided on the contact ring (32). The control component (4) includes a control ring (41) that rotates on the side wall of the main body (21). The control ring (41) and the contact ring block (33) are threadedly connected. A limit groove (34) is opened on the inner wall of the contact groove (3). A limit block (35) for inserting and sliding in the limit groove (34) is provided on the contact ring block (33). A clearance ring groove (411) for giving way to the control ring (41) is opened on the main body (21). A pull strap (42) is hinged on the control ring (41).

2. The sealing device for the liquid passage joint surface of the planetary mechanism of a coal mining machine according to claim 1, characterized in that: A second sealing ring (23) is embedded on the side wall of the bearing housing, and the second sealing ring (23) abuts and seals against the side wall of the inner gear ring.

3. The sealing device for the liquid passage joint surface of the planetary mechanism of a coal mining machine according to claim 1, characterized in that: The clearance ring groove (411) includes a control groove (43) and a fixing groove (44). A connecting groove (45) connects the control groove (43) and the fixing groove (44). The control groove (43) is connected to the abutting groove (3). The control ring (41) includes a control threaded ring (5) that rotates in the control groove (43) and a fixing ring (51) that rotates in the fixing groove (44). A connecting ring (52) is provided between the control threaded ring (5) and the fixing ring (51). The control threaded ring (5) is threadedly connected to the abutting ring block (33).

4. The sealing device for the liquid passage joint surface of the planetary mechanism of a coal mining machine according to claim 3, characterized in that: The inner wall of the fixing groove (44) is provided with a triangular groove (6), the pull strap (42) is provided with a triangular plug (61) for insertion into the triangular groove (6), and the fixing ring (51) is provided with a through groove (62) for the triangular plug (61) to pass through.

5. A sealing device for the liquid passage joint surface of a planetary mechanism of a coal mining machine according to claim 4, characterized in that: The pull strap (42) is also provided with a block (63), and the fixing ring (51) is provided with a square groove (64) for the block (63) to be inserted and limited. The triangular insert (61) is located between the block (63) and the hinge of the pull strap (42).

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