High-pressure wear-resistant floating ball valve

Abstract

The invention provides a high-pressure wear-resistant floating ball valve, which belongs to the technical field of floating ball valves, and comprises an outer valve body, a dredging assembly, a first magnetic block, a second magnetic block, a first magnetic block, a second magnetic block, a third magnetic block, a third magnetic block, a fourth magnetic block and a fourth magnetic block, the dredging assembly utilizes a rotating plate to guide part of fluid, so that damage to the sealing performance of the ball valve is reduced; the buffer assembly reduces damage of fluid to the sealing structure through blocking. The flow dividing assembly controls impact on a valve element of the ball valve through the flow speed of fluid. The internal ball valve has the beneficial effects that the movable rod drives the moving plate to move downwards through the first magnetic block and the second magnetic block, then the rotating rod is driven to rotate, meanwhile, the sealing plate rotates in the transition box and communicates the two ends of the communicating pipe, and therefore impact of fluid on the internal ball valve is relieved, abrasion to the valve element is reduced, and the sealing performance is better ensured; and the service life of the whole ball valve is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of floating ball valves, and in particular to a high-pressure wear-resistant floating ball valve. Background Art

[0002] The ball valve was introduced in the 1950s. It has a 90-degree rotating action. The plug body is a sphere, driven by the valve stem, and rotates around the axis of the ball valve. The ball valve is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. It only needs to rotate 90 degrees and a very small torque to close tightly. It is widely used in oil refining, long-distance pipelines, chemicals, papermaking, pharmaceuticals, water conservancy, electricity, municipal administration, steel and other industries. Ball valves can generally be divided into floating ball valves, fixed ball valves, elastic ball valves and V-type ball valves.

[0003] During the use of the existing floating ball valve, since the ball of the ball valve is floating, the ball may produce a certain deviation under the impact of increased pressure of the medium, causing wear to the sealing ring, affecting the overall sealing effect of the valve body, and reducing the service life of the ball valve. In addition, due to the floating of the ball on the valve seat, the friction between the ball and the valve seat is relatively large, which will accelerate the wear process of the valve and cause the sealing ring to age quickly, resulting in a shortened service life of the sealing ring. How to invent a high-pressure wear-resistant floating ball valve to solve these problems has become an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0004] In order to make up for the above shortcomings, the present invention provides a high-pressure wear-resistant floating ball valve, which aims to solve the problem that fluid impact may cause the ball to shift, cause wear to the sealing ring, affect the overall sealing effect of the valve body, and reduce the service life of the ball valve.

[0005] The present invention is achieved in that:

[0006] The present invention provides a high-pressure wear-resistant floating ball valve, comprising an outer valve body, both ends of the outer valve body are fixedly connected to connecting pipes, one side of the outer valve body is provided with a rotating plate, the rotating plate is connected to a magnetic block 1, the inner part of the outer valve body is provided with a sealing gasket, and further comprises:

[0007] A dredging assembly, wherein the dredging assembly is fixedly connected to the connecting pipe, and the dredging assembly uses a rotating plate to guide part of the fluid so as to reduce damage to the sealing performance of the ball valve;

[0008] A buffer assembly, the buffer assembly is located inside the outer valve body, and the buffer assembly reduces the damage of the fluid to the sealing structure by blocking;

[0009] The flow diverter assembly is located inside the outer valve body and uses the flow velocity of the fluid to control the impact on the valve core of the ball valve.

[0010] Preferably, a fixing plate is fixedly connected to the outer wall of the outer valve body. Limiting grooves are provided on the inner walls of the symmetric two sides of the outer valve body. The limiting grooves are arranged in a ring shape. A number of circumferentially arrayed first telescopic springs are fixedly connected to the inside of the limiting grooves away from the openings. One end of each first telescopic spring is fixedly connected to one side of the sealing gasket. The sealing gasket is slidably connected to the inner wall of the limiting groove.

[0011] Preferably, the dredging assembly includes a communicating pipe and a transition box. The transition box is fixedly connected to the communicating pipe. The communicating pipe is arranged in a "C" shape. The two ends of the communicating pipe are respectively fixedly connected to the outer walls of two connecting pipes. An upper sealing strip is fixedly connected to the upper inner wall of the transition box. A lower sealing strip is fixedly connected to the lower inner wall of the transition box. A sealing baffle is arranged in the middle of the transition box. A support sleeve is fixedly connected to the outer wall of the transition box. A rotating rod is rotatably connected to the inner wall of the support sleeve. One end of the rotating rod penetrates through the side wall of the transition box and is fixedly connected to the sealing baffle. A gear disk is fixedly connected to the end of the rotating rod located outside the support sleeve.

[0012] Preferably, the dredging assembly further includes a moving plate, a movable rod and a return spring. The return spring is sleeved on the outer wall of one end of the movable rod. The movable rod is arranged in a "T" shape. A second magnetic block is fixedly connected to the upper end of the movable rod. The lower end of the movable rod penetrates through the side wall of the fixing plate and is fixedly connected to the moving plate. The moving plate is arranged in an "L" shape. A number of teeth meshing with the gear disk are fixedly connected to one side of the moving plate.

[0013] Preferably, the buffering assembly includes an inner ball valve. The inner ball valve is located between the two sealing gaskets. The outer wall of the inner ball valve is movably connected to the inner wall of the outer valve body. One end of the inner ball valve passes through the side wall of the outer valve body and is fixedly connected to the rotating plate.

[0014] Preferably, a water inlet groove is provided on one side of the inner ball valve. A through groove is provided on the inner wall of the water inlet groove. A buffer groove is provided on the inner wall of the through groove away from the water inlet groove. A drainage groove is provided between the inner wall of the buffer groove and the outer wall of the inner ball valve. A number of evenly distributed partition plates are fixedly connected to the inner wall of the through groove. Arc-shaped plates that intersect with each other are fixedly connected to the two side walls of each partition plate.

[0015] Preferably, the flow splitting assembly includes a fixed column. The fixed column is fixedly connected to the inner wall of the buffer groove. A flow splitting plate is fixedly connected to the outer wall of the fixed column. There are two flow splitting plates. An installation groove is provided at one end of the flow splitting plate. A telescopic plate is slidably connected to the inner wall of the installation groove. The telescopic plate is arranged in an "L" shape.

[0016] Preferably, a second telescopic spring is provided inside the installation slot, and two ends of the second telescopic spring are respectively fixedly connected to the inner wall of the installation slot away from the opening and the side wall of the telescopic plate.

[0017] The beneficial effects of the present invention are:

[0018] When the ball valve changes from a blocked state to a connected state, the interaction between the first and second magnetic blocks causes the movable rod to move downward, and the meshing of the teeth and the gear plate drives the rotating rod to rotate, and at the same time drives the sealing plate to rotate in the transition box, so that the two ends of the connecting pipe are connected, thereby reducing the impact of the fluid on the inner ball valve, thereby reducing the wear on the valve core, better ensuring the sealing, and ensuring the overall service life of the ball valve; when the fluid flows through the through groove, it will first be divided into multiple parts by the partition plate, and when the fluid passes through the partition plate, it will pass through The interlaced arc plates guide the fluid to fluctuate up and down, thereby alleviating the impact force of the fluid, reducing the flow rate of the fluid medium, and reducing the scouring of the inner ball valve. As the fluid flow rate increases, the impact force on the telescopic plate can be increased, thereby stretching the telescopic spring 2 and expanding the overall blocking area of ​​the telescopic plate and the diverter plate. This reduces the discharge capacity of the buffer tank, slows down the flow rate of the fluid, reduces the deviation of the inner ball valve, and effectively reduces the impact friction of the inner ball valve on the sealing gasket, thereby protecting the sealing gasket, making the valve body sealing effect better, and increasing the service life of the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the overall front side structure of a high-pressure wear-resistant floating ball valve provided by an embodiment of the present invention;

[0021] Figure 2 It is a schematic diagram of the overall rear side structure of a high-pressure wear-resistant floating ball valve provided in an embodiment of the present invention;

[0022] Figure 3 It is a schematic diagram of the longitudinal cross-section structure of a high-pressure wear-resistant floating ball valve provided by an embodiment of the present invention;

[0023] Figure 4 It is a schematic diagram of the cross-sectional structure of a high-pressure wear-resistant floating ball valve provided by an embodiment of the present invention;

[0024] Figure 5 A high-pressure wear-resistant floating ball valve provided by the embodiment of the present invention Figure 4 A schematic diagram of the structure enlargement in the middle;

[0025] Figure 6 It is a schematic diagram of the front end structure of an inner ball valve of a high-pressure wear-resistant floating ball valve provided by an embodiment of the present invention;

[0026] Figure 7 It is a schematic diagram of the rear end structure of an inner ball valve of a high-pressure wear-resistant floating ball valve provided by an embodiment of the present invention;

[0027] Figure 8 It is a partial structural cross-sectional view of an inner ball valve of a high-pressure wear-resistant floating ball valve provided by an embodiment of the present invention;

[0028] Fig. 9 It is a schematic structural diagram of a high-pressure wear-resistant floating ball valve diverter assembly provided in an embodiment of the present invention.

[0029] In the figure: 1. connecting pipe; 2. magnetic block 1; 3. rotating plate; 4. outer valve body; 41. fixed plate; 42. limiting groove; 43. telescopic spring 1; 5. dredging component; 51. connecting pipe; 52. transition box; 521. upper sealing strip; 522. lower sealing strip; 53. supporting sleeve; 54. moving plate; 541. teeth; 55. gear plate; 56. rotating rod; 561. sealing baffle; 57. movable rod; 571. magnetic block 2; 58. reset spring; 6. buffer component; 61. water inlet groove; 62. through groove; 63. partition plate; 631. arc plate; 64. inner ball valve; 65. buffer groove; 66. drainage groove; 7. diverter component; 71. fixed column; 72. telescopic plate; 73. diverter plate; 74. installation groove; 75. telescopic spring 2; 8. sealing gasket. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example, see Figure 1-Figure 9 A high-pressure wear-resistant floating ball valve comprises an outer valve body 4, both ends of the outer valve body 4 are fixedly connected with connecting pipes 1, a rotating plate 3 is provided on one side of the outer valve body 4, the rotating plate 3 is connected with a magnetic block 2, a sealing gasket 8 is provided inside the outer valve body 4, and further comprises:

[0032] The dredging component 5 is fixedly connected to the connecting pipe 1. The dredging component 5 uses the rotating plate 3 to guide part of the fluid to reduce the damage to the sealing performance of the ball valve;

[0033] The buffer component 6 is located inside the outer valve body 4, and the buffer component 6 reduces the damage of the fluid to the sealing structure by blocking;

[0034] The flow diverter assembly 7 is located inside the outer valve body 4 and controls the impact on the valve core of the ball valve by using the flow velocity of the fluid.

[0035] Furthermore; the outer wall of the outer valve body 4 is fixedly connected with a fixing plate 41, and the inner walls on both sides of the outer valve body 4 are symmetrically provided with limiting grooves 42, the limiting grooves 42 are arranged in a ring shape, and the inner part of the limiting groove 42 away from the opening is fixedly connected with a plurality of telescopic springs 43 distributed in a circumferential array, one end of the telescopic spring 43 is fixedly connected to one side of the sealing gasket 8, and the sealing gasket 8 is slidably connected to the inner wall of the limiting groove 42.

[0036] It should be noted that: through the elasticity of the telescopic spring 43, one end of the sealing gasket 8 is in close contact with the outer wall of the inner ball valve 64, which can ensure a good sealing effect when the inner ball valve 64 is closed, and effectively avoid the problem of liquid leakage. At the same time, it can also effectively position the inner ball valve 64 when it is slightly worn. In addition, the telescopic spring 43 is in a compressed state in the initial state. When the inner ball valve 64 is impacted and shaken, the sealing gasket 8 on one side will be squeezed, so that the sealing gasket 8 slides inside the limit groove 42 and further squeezes the telescopic spring 43, while the sealing gasket 8 on the other side is always in contact with the inner ball valve 64 through the elastic recovery of the telescopic spring 43, thereby ensuring the sealing effect between the outer wall of the inner ball valve 64 and the sealing gasket 8.

[0037] Reference Figure 1-Figure 4, Further; the dredging component 5 includes a connecting pipe 51 and a transition box 52. The transition box 52 is fixedly connected to the connecting pipe 51. The connecting pipe 51 is arranged in a "C" shape. The two ends of the connecting pipe 51 are respectively fixedly connected to the outer walls of the two connecting pipes 1. The upper inner wall of the transition box 52 is fixedly connected with an upper sealing strip 521, and the lower inner wall of the transition box 52 is fixedly connected with a lower sealing strip 522. A sealing baffle 561 is arranged in the middle of the transition box 52. The outer wall of the transition box 52 is fixedly connected with a support sleeve 53. A rotating rod 56 is rotatably connected to the inner wall of the support sleeve 53. One end of the rotating rod 56 penetrates through the side wall of the transition box 52 and is fixedly connected to the sealing baffle 561. A gear disc 55 is fixedly connected to the end of the rotating rod 56 located outside the support sleeve 53; the dredging component 5 further includes a moving plate 54, a movable rod 57 and a return spring 58. The return spring 58 is sleeved on the outer wall of one end of the movable rod 57. The movable rod 57 is arranged in a "T" shape. The upper end of the movable rod 57 is fixedly connected with a second magnet 571. The lower end of the movable rod 57 penetrates through the side wall of the fixed plate 41 and is fixedly connected to the moving plate 54. The moving plate 54 is arranged in an "L" shape. A plurality of teeth 541 meshing with the gear disc 55 are fixedly connected to one side of the moving plate 54.

[0038] It should be noted that when the ball valve is changed from a blocked state to a connected state, the rotating plate 3 is first rotated by 90 degrees so that the magnet 1 2 is located directly above the magnet 2 571, and the lower end of the magnet 1 2 and the upper end of the magnet 2 571 have the same polarity. Therefore, when the magnet 1 2 gradually approaches the magnet 2 571, the movable rod 57 moves downward due to the mutual repulsion, and the reset spring 58 is compressed at the same time. As the movable rod 57 moves, the movable plate 54 is driven to move synchronously. Because the teeth 541 are meshed with the gear plate 55, the rotating rod 56 is driven to rotate through the gear plate 55 during the downward movement of the movable plate 54, and the stability of the rotating rod 56 during the rotation process is maintained by the support sleeve 53. When the rotating rod 56 rotates, it drives the sealing plate 561 to rotate in the transition box 52, so that the sealing plate 561 is respectively connected to the upper sealing strip 521 and the lower sealing strip 521. The strip 522 is separated, so that the two ends of the connecting pipe 51 are connected through the transition box 52. In addition, when the movable plate 54 moves to the lowermost end, the rotating rod 56 no longer rotates and makes the sealing plate 561 parallel to the bottom wall of the transition box 52. In this way, when the ball valve is in a connected state, a part of the fluid can be transported from the connecting pipe 51, thereby reducing the impact of the fluid on the inner ball valve 64, thereby reducing the wear on the valve core, better ensuring the sealing performance, and ensuring the overall service life of the ball valve. In addition, when closing the ball valve, the rotating plate 3 is rotated anyway. At this time, the magnetic block 1 2 moves away from the top of the magnetic block 2 571, and the two no longer generate an interaction force. Then, the elastic recovery of the reset spring 58 drives the movable rod 57 and the movable plate 54 to return to their positions. At the same time, the rotating rod 56 drives the sealing baffle 561 to rotate in the opposite direction, thereby completing the blocking of the transition box 52 again through the connection with the upper sealing strip 521 and the lower sealing strip 522.

[0039] Reference Figure 3-Figure 9, further; the buffer assembly 6 includes an inner ball valve 64, the inner ball valve 64 is located between the two sealing gaskets 8, the outer wall of the inner ball valve 64 is movably connected to the inner wall of the outer valve body 4, and one end of the inner ball valve 64 passes through the side wall of the outer valve body 4 and is fixedly connected to the rotating plate 3; a water inlet groove 61 is provided on one side of the inner ball valve 64, a through groove 62 is provided on the inner wall of the water inlet groove 61, a buffer groove 65 is provided on the inner wall of the through groove 62 away from the water inlet groove 61, a drainage groove 66 is provided between the inner wall of the buffer groove 65 and the outer wall of the inner ball valve 64, and a plurality of evenly distributed partition plates 63 are fixedly connected to the inner wall of the through groove 62, The side walls at both ends of the partition 63 are fixedly connected with interlaced arc plates 631; the diverter assembly 7 includes a fixed column 71, the fixed column 71 is fixedly connected to the inner wall of the buffer groove 65, the outer wall of the fixed column 71 is fixedly connected with a diverter plate 73, two diverter plates 73 are provided, one end of the diverter plate 73 is provided with a mounting groove 74, the inner wall of the mounting groove 74 is slidably connected with a telescopic plate 72, and the telescopic plate 72 is set in an "L" shape; a telescopic spring 75 is provided inside the mounting groove 74, and the two ends of the telescopic spring 75 are respectively fixedly connected to the inner wall of the mounting groove 74 away from the opening and the side wall of the telescopic plate 72.

[0040] It should be noted that: when the ball valve is in a connected state, the fluid first passes through the water inlet groove 61, and then enters the interior of the buffer groove 65 through the through groove 62. In the process of the fluid flowing through the through groove 62, the fluid will first be divided into multiple parts by the partition plate 63. While the fluid passes through the partition plate 63, the fluid will be guided to fluctuate up and down through the interlaced arc plates 631, thereby alleviating the impact force of the fluid, reducing the flow rate of the fluid medium, and reducing the scouring of the inner ball valve 64. After the fluid enters the interior of the buffer groove 65, the flow rate is relatively slow, and then the fluid impacts the diverter plate 73 and the telescopic plate 72, and the horizontal angle between the diverter plate 73 and the bottom wall of the buffer groove 65 is 4 5 degrees, and the angle between the two diverter plates 73 is 90 degrees, so it can better ensure the discharge volume of the fluid while guiding the flow of the fluid, and with the increase of the fluid flow rate, the impact force on the telescopic plate 72 can be increased, so that the telescopic plate 72 slides inside the mounting groove 74, and stretches the telescopic spring 2 75 to expand the overall blocking area of ​​the telescopic plate 72 and the diverter plate 73, thereby reducing the discharge capacity of the buffer groove 65 to slow down the flow rate of the fluid, reduce the offset of the inner ball valve 64, and effectively reduce the impact friction of the inner ball valve 64 on the sealing gasket 8, thereby protecting the sealing gasket 8, making the valve body sealing effect better, and increasing the service life of the valve body.

[0041] It should be noted that the specific model and specifications of the motor need to be selected and determined based on the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-pressure wear-resistant floating ball valve, comprising an outer valve body (4), both ends of the outer valve body (4) are fixedly connected to connecting pipes (1), one side of the outer valve body (4) is provided with a rotating plate (3), the rotating plate (3) is connected to a magnetic block (2), and a sealing gasket (8) is provided inside the outer valve body (4), characterized in that: It further includes: A dredging component (5), the dredging component (5) is fixedly connected to the connecting pipe (1), and the dredging component (5) uses a rotating plate (3) to guide part of the fluid so as to reduce the damage to the sealing performance of the ball valve; A buffer component (6), the buffer component (6) is located inside the outer valve body (4), and the buffer component (6) uses a baffle to reduce the damage to the sealing structure caused by the fluid; A flow splitting component (7), the flow splitting component (7) is located inside the outer valve body (4), and the flow splitting component (7) controls the impact on the ball valve spool by the flow velocity of the fluid.

2. A high pressure wear-resistant floating ball valve according to claim 1, characterized in that: The outer wall of the outer valve body (4) is fixedly connected with a fixing plate (41), the inner walls on both symmetric sides of the outer valve body (4) are provided with limiting grooves (42), the limiting grooves (42) are arranged in a ring shape, and a plurality of circumferentially arrayed first telescopic springs (43) are fixedly connected inside the limiting grooves (42) far away from the openings. One end of the first telescopic spring (43) is fixedly connected to one side of the sealing gasket (8), and the sealing gasket (8) is slidably connected to the inner wall of the limiting groove (42).

3. A high pressure wear-resistant floating ball valve according to claim 2, characterized in that: The dredging component (5) includes a communicating pipe (51) and a transition box (52), the transition box (52) is fixedly connected to the communicating pipe (51), the communicating pipe (51) is arranged in a "C" shape, the two ends of the communicating pipe (51) are respectively fixedly connected to the outer walls of the two connecting pipes (1), an upper sealing strip (521) is fixedly connected to the upper inner wall of the transition box (52), a lower sealing strip (522) is fixedly connected to the lower inner wall of the transition box (52), a sealing baffle (561) is arranged in the middle of the transition box (52), a support sleeve (53) is fixedly connected to the outer wall of the transition box (52), a rotating rod (56) is rotatably connected to the inner wall of the support sleeve (53), one end of the rotating rod (56) penetrates through the side wall of the transition box (52) and is fixedly connected to the sealing baffle (561), and a gear disc (55) is fixedly connected to the end of the rotating rod (56) located outside the support sleeve (53).

4. A high pressure wear-resistant floating ball valve according to claim 3, characterized in that: The dredging component (5) further includes a moving plate (54), a movable rod (57) and a return spring (58), the return spring (58) is sleeved on the outer wall of one end of the movable rod (57), the movable rod (57) is arranged in a "T" shape, a second magnet block (571) is fixedly connected to the upper end of the movable rod (57), the lower end of the movable rod (57) penetrates through the side wall of the fixing plate (41) and is fixedly connected to the moving plate (54), the moving plate (54) is arranged in an "L" shape, and a plurality of teeth (541) meshing with the gear disc (55) are fixedly connected to one side of the moving plate (54).

5. A high pressure wear-resistant floating ball valve according to claim 2, characterized in that: The buffer component (6) includes an inner ball valve (64), the inner ball valve (64) is located between the two sealing gaskets (8), the outer wall of the inner ball valve (64) is movably connected to the inner wall of the outer valve body (4), and one end of the inner ball valve (64) passes through the side wall of the outer valve body (4) and is fixedly connected to the rotating plate (3).

6. A high pressure wear-resistant floating ball valve according to claim 5, characterized in that: A water inlet groove (61) is provided on one side of the inner ball valve (64), a through groove (62) is provided on the inner wall of the water inlet groove (61), a buffer groove (65) is provided on the inner wall of one end of the through groove (62) away from the water inlet groove (61), a drainage groove (66) is provided between the inner wall of the buffer groove (65) and the outer wall of the inner ball valve (64), a plurality of evenly distributed partition plates (63) are fixedly connected to the inner wall of the through groove (62), and arc-shaped plates (631) that are staggered are fixedly connected to the side walls at both ends of the partition plate (63).

7. A high pressure wear-resistant floating ball valve according to claim 6, characterized in that: The flow dividing assembly (7) comprises a fixed column (71), wherein the fixed column (71) is fixedly connected to the inner wall of the buffer groove (65), and the outer wall of the fixed column (71) is fixedly connected to a flow dividing plate (73), wherein two flow dividing plates (73) are provided, and a mounting groove (74) is formed at one end of the flow dividing plate (73), and a telescopic plate (72) is slidably connected to the inner wall of the mounting groove (74), and the telescopic plate (72) is arranged in an "L" shape.

8. A high pressure wear-resistant floating ball valve according to claim 7, characterized in that: A second telescopic spring (75) is arranged inside the installation groove (74), and two ends of the second telescopic spring (75) are respectively fixedly connected to the inner wall of the installation groove (74) away from the opening and the side wall of the telescopic plate (72).

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