Hydraulic hoist for miter gate

Abstract

The invention discloses a hydraulic hoist for a miter gate, which belongs to the field of hydraulic engineering and comprises an oil cylinder, a guide rod is fixedly connected to one side of the oil cylinder, a second connecting sleeve is fixedly connected to one side of the guide rod, a piston rod is slidably connected to the other side of the oil cylinder, and a first connecting sleeve is fixedly connected to one side of the piston rod. The side, away from the first connecting sleeve, of the piston rod is connected with an extrusion assembly, and the outer surface of the oil cylinder is fixedly connected with an oil liquid filtering assembly. The extrusion ring can extrude the rubber stress ring to slightly expand, so that the edge of the piston is expanded, the outer surface of the piston is tightly attached to the interior of the oil cylinder, the sealing performance of the piston is guaranteed, and the situation that oil liquid leaks and influences the pressure of the hydraulic hoist due to gaps caused by abrasion of the piston is avoided; the situation that chippings and particles generated by abrasion of the piston are possibly embedded into the sealing piece, and new scratches are generated on the piston is prevented.

Description

Technical Field

[0001] The invention relates to the field of water conservancy projects, and more specifically to a hydraulic opening and closing machine for a miter door. Background Art

[0002] The hydraulic gate hoist is generally composed of a hydraulic system and a hydraulic cylinder. Under the control of the hydraulic system, the inner wall of the piston in the hydraulic cylinder makes axial reciprocating motion, thereby driving the connecting rod and the gate connected to the piston to make linear motion to achieve the purpose of opening and closing the orifice. It is mainly used to open and close the gates on water conservancy projects.

[0003] The hydraulic hoist is generally composed of a hydraulic system and a hydraulic cylinder. Under the control of the hydraulic system, the inner wall of the piston in the hydraulic cylinder makes axial reciprocating motion, thereby driving the connecting rod and the gate connected to the piston to make linear motion to achieve the purpose of opening and closing the orifice; However, in actual use, the powerful thrust of the hydraulic gate opener will cause friction between the piston and the inside of the cylinder. The friction will cause certain wear on the piston and cause oil leakage. The debris and particles produced by the wear of the piston may be embedded in the seal and damage the working part of the seal, which will not only further aggravate internal leakage, but may also lead to new scratch areas, forming a vicious circle, and ultimately affecting the sealing and durability of the hydraulic system. Summary of the invention

[0004] In view of the problems existing in the prior art, the object of the present invention is to provide a hydraulic opening and closing machine for a miter door.

[0005] To solve the above problems, the present invention adopts the following technical solutions.

[0006] A hydraulic opening and closing machine for a miter door comprises an oil cylinder, one side of the oil cylinder is fixedly connected to a guide rod, one side of the guide rod is fixedly connected to a second connecting sleeve, the other side of the oil cylinder is slidably connected to a piston rod, one side of the piston rod is fixedly connected to a first connecting sleeve, the side of the piston rod away from the first connecting sleeve is connected to an extrusion assembly, and the outer surface of the oil cylinder is fixedly connected to an oil filter assembly.

[0007] The extrusion assembly includes a piston connected to one side of a piston rod, a fixed plate fixed to the outer surface of the piston rod, an extrusion rod fixed to the top of the oil cylinder and a ring slidably connected to the outer surface of the piston rod. A groove is provided inside the piston, a rubber stress ring is fixedly connected to the inner surface of the groove, a threaded rod is connected to the internal thread of the fixed plate, a first gear is fixedly connected to the top of the outer surface of the threaded rod, an extrusion ring is connected to the bottom of the threaded rod via a bearing, a second trapezoidal plate is fixedly connected to the upper surface of the ring, a rotating tube is rotatably connected to the outer surface of the rotating tube, and a first annular rack is fixedly connected to the outer surface of the rotating tube.

[0008] Furthermore, the number of the fixing plates is four, the first gear is meshed with the first annular rack, the fixing plate is located below the circular ring, the number of the second trapezoidal plates and the extrusion rods are two, the extrusion rod is located above the second trapezoidal plate, the cross-section of the extrusion ring is trapezoidal, the cross-section of the rubber stress ring is triangular, the hypotenuses of the extrusion ring and the rubber stress ring are opposite, the front and rear sides of the upper surface of the circular ring are connected with a buffer assembly, and the lower surface of the piston is fixedly connected with a disassembly assembly.

[0009] Furthermore, the buffer assembly includes two support plates fixed on the upper surface of the circular ring and two through grooves symmetrically opened on the inner surface of the rotating tube, the interior of the support plate is slidably connected to a telescopic rod, one side of the telescopic rod is fixedly connected to a first trapezoidal plate, and the outer surface of the telescopic rod is sleeved with a spring.

[0010] Furthermore, the spring is located between the support plate and the first trapezoidal plate and fixedly connected to each other. The first trapezoidal plate is located inside the through slot, and the hypotenuse of the first trapezoidal plate is in contact with the side wall of the through slot.

[0011] Furthermore, the disassembly assembly includes a threaded hole formed at the bottom of the piston rod, a fixed circular plate fixed to the lower surface of the piston, and a through hole formed inside the piston, and a threaded column is connected through the interior of the fixed circular plate.

[0012] Furthermore, the top of the threaded column passes through the through hole and extends to the inside of the threaded hole, and the through hole is connected to the threaded hole through threads.

[0013] Furthermore, the oil filter assembly includes an oil storage tank fixed on the outer surface of the oil cylinder, one side of the oil storage tank is fixedly connected to a hydraulic pump, one end of the hydraulic pump is fixedly connected to a guide pipe, the other end of the hydraulic pump is fixedly connected to a three-way pipe, the two ends of the three-way pipe are respectively fixedly connected to a first one-way valve and a second one-way valve, a filter frame is sleeved on one side of the second one-way valve, and a sealing cover is provided on the top of the oil storage tank.

[0014] Furthermore, one side of the guide pipe extends to the interior of the oil cylinder, the three-way pipe is located inside the oil storage tank, the upper surface of the sealing cover is provided with an oil filling hole, one side of the inner surface of the filter frame is connected to a cleaning component, the direction of the first one-way valve is to flow toward the three-way pipe, and the direction of the second one-way valve is from the three-way pipe to the filter frame.

[0015] Furthermore, the cleaning assembly includes an impeller connected to one side of the filter frame, a third gear rotatably connected to one side of the inner surface of the filter frame, and a second annular rack slidably connected to the edge of one side of the inner surface of the filter frame, two cleaning brushes are symmetrically arranged on the outer surface of the second annular rack, and a second gear is fixedly connected to one side of the impeller.

[0016] Furthermore, the impeller is connected to the side wall of the filter frame through a connecting rod, the axis of the impeller coincides with the axis of the filter frame, the third gear is meshed with the second gear and the second annular rack, and the cleaning brush is in contact with the side wall of the filter frame.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. This solution sets an extrusion assembly, and the extrusion ring squeezes the rubber stress ring and expands slightly, thereby expanding the edge of the piston and making the outer surface of the piston fit tightly with the inside of the oil cylinder, thereby ensuring the sealing of the piston, avoiding oil leakage caused by gaps in the worn piston, and affecting the pressure of the hydraulic gate opener, and preventing debris and particles generated by piston wear from being embedded in the seal and causing new scratches on the piston.

[0018] 2. This solution provides a buffer assembly. When the extrusion ring cannot move further downward, it can ensure that the second trapezoidal plate can rotate smoothly without being hindered by the first gear, and the extrusion rod will not be broken. At the same time, it can ensure that the movement of the piston rod is not hindered when the rotating tube is fixed. When the piston rod is reset, the spring pushes the telescopic rod to reset, so that the inclined surface of the telescopic rod slides on the edge of the through groove. The force generated by the sliding pushes the support plate to drive the circular ring to move, thereby resetting the circular ring.

[0019] 3. This solution provides a disassembly component, which rotates the threaded column to disengage it from the threaded hole, thereby releasing the fixing effect of the piston, thereby removing the piston from the piston rod and replacing it with a new piston for continued use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a cross-sectional structural schematic diagram of the present invention; Figure 3 For the present invention Figure 2 A magnified image of point A; Figure 4 Schematic diagram of the extrusion assembly structure of the present invention Figure 1 ; Figure 5 Schematic diagram of the extrusion assembly structure of the present invention Figure 2 ; Figure 6 It is a schematic diagram of the structure of the buffer assembly of the present invention; Figure 7 It is a schematic diagram of the disassembly assembly structure of the present invention; Figure 8 The oil filter assembly structure of the present invention is schematically shown in FIG. Figure 1 ; Fig. 9 The oil filter assembly structure of the present invention is schematically shown in FIG. Figure 2 ; Fig.10 It is a schematic diagram of the cleaning component structure of the present invention.

[0021] Description of the numbers in the figure: 1. Oil cylinder; 2. Piston rod; 3. First connecting sleeve; 4. Second connecting sleeve; 5. Extrusion assembly; 51. Piston; 52. Groove; 53. Extrusion ring; 54. Rubber stress ring; 55. Buffer assembly; 551. Through slot; 552. First trapezoidal plate; 553. Support plate; 554. Telescopic rod; 555. Spring; 56, disassembly assembly; 561, threaded hole; 562, threaded column; 563, fixed circular plate; 564, through hole; 57, rotating tube; 58, circular ring; 59, second trapezoidal plate; 510, threaded rod; 511, first gear; 512, fixed plate; 513, first annular rack; 514, extrusion rod; 6. Oil filter assembly; 61. Oil storage tank; 62. Sealing cover; 63. Hydraulic pump; 64. Flow guide pipe; 65. Three-way pipe; 66. First one-way valve; 67. Second one-way valve; 68. Filter frame; 69, cleaning assembly; 691, cleaning brush; 692, second annular rack; 693, impeller; 694, second gear; 695, third gear; 7. Guide rod. DETAILED DESCRIPTION

[0022] 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; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0023] See also Figures 1 to 10 A hydraulic opening and closing machine for a miter door comprises an oil cylinder 1, one side of the oil cylinder 1 is fixedly connected to a guide rod 7, one side of the guide rod 7 is fixedly connected to a second connecting sleeve 4, the other side of the oil cylinder 1 is slidably connected to a piston rod 2, one side of the piston rod 2 is fixedly connected to a first connecting sleeve 3, the side of the piston rod 2 away from the first connecting sleeve 3 is connected to an extrusion assembly 5, and the outer surface of the oil cylinder 1 is fixedly connected to an oil filter assembly 6.

[0024] like Figure 2 - Figure 6As shown, the extrusion assembly 5 includes a piston 51 connected to one side of the piston rod 2, a fixed plate 512 fixed to the outer surface of the piston rod 2, an extrusion rod 514 fixed to the top of the cylinder 1 and a ring 58 slidably connected to the outer surface of the piston rod 2, a groove 52 is opened inside the piston 51, and a rubber stress ring 54 is fixedly connected to the inner surface of the groove 52, a threaded rod 510 is connected to the inner thread of the fixed plate 512, a first gear 511 is fixedly connected to the top of the outer surface of the threaded rod 510, an extrusion ring 53 is connected to the bottom of the threaded rod 510 through a bearing, a second trapezoidal plate 59 is fixedly connected to the upper surface of the ring 58, a rotating tube 57 is rotatably connected to the outer surface of the rotating tube 57, and a first annular rack 513 is fixedly connected to the outer surface of the rotating tube 57.

[0025] There are four fixing plates 512, the first gear 511 and the first annular rack 513 are meshed with each other, the fixing plate 512 is located below the circular ring 58, the second trapezoidal plates 59 and the extrusion rods 514 are both two, the extrusion rods 514 are located above the second trapezoidal plate 59, the cross-section of the extrusion ring 53 is trapezoidal, the cross-section of the rubber stress ring 54 is triangular, the hypotenuses of the extrusion ring 53 and the rubber stress ring 54 are opposite, the front and rear sides of the upper surface of the circular ring 58 are connected with the buffer assembly 55, and the lower surface of the piston 51 is fixedly connected with the disassembly assembly 56.

[0026] By providing the above technical solution, when the piston rod 2 moves inside the oil cylinder 1, the piston 51 is driven to move as a whole, and the second trapezoidal plate 59 is driven to gradually approach the extrusion rod 514. When the extrusion rod 514 and the hypotenuse of the second trapezoidal plate 59 contact each other, the second trapezoidal plate 59 and the extrusion rod 514 slide against each other, and the two second trapezoidal plates 59 drive the ring 58 to rotate, and the transmission of the buffer assembly 55 drives the rotating tube 57 to rotate, so that the first annular rack 513 rotates synchronously, and the first annular rack 513 drives the four first gears 511 to rotate synchronously, and the first gear 511 drives the threaded rod 510 to rotate. Under the action of the thread, The threaded rod 510 moves downward slightly, squeezing the inclined surface of the extrusion ring 53 onto the inclined surface of the rubber stress ring 54, causing the rubber stress ring 54 to expand slightly, thereby expanding the edge of the piston 51, making the outer surface of the piston 51 fit tightly against the inside of the oil cylinder 1, thereby ensuring the sealing of the piston 51. At the same time, even if the piston 51 is worn, the rubber stress ring 54 deforms to expand the piston 51, so that the piston 51 always remains in contact with the inner wall of the oil cylinder 1, avoiding leakage of oil due to gaps in the worn piston 51, affecting the pressure of the hydraulic gate opener, and preventing debris and particles generated by the wear of the piston 51 from being embedded in the seal and causing new scratches on the piston 51.

[0027] like Figure 6As shown, the buffer assembly 55 includes two support plates 553 fixed on the upper surface of the ring 58 and two through grooves 551 symmetrically opened on the inner surface of the rotating tube 57. The support plates 553 are internally slidably connected to a telescopic rod 554, one side of the telescopic rod 554 is fixedly connected to a first trapezoidal plate 552, and the outer surface of the telescopic rod 554 is sleeved with a spring 555.

[0028] The spring 555 is located between the support plate 553 and the first trapezoidal plate 552 and fixedly connected to each other. The first trapezoidal plate 552 is located inside the through slot 551 , and the hypotenuse of the first trapezoidal plate 552 contacts the side wall of the through slot 551 .

[0029] During each movement of the piston rod 2, the extrusion rod 514 will contact the second trapezoidal plate 59. However, when the piston 51 is tightly fitted with the inside of the oil cylinder 1, the extrusion ring 53 cannot move downward, so that the second trapezoidal plate 59 is in a fixed state, which will hinder the movement of the piston rod 2 and even cause the extrusion rod 514 to bend. Therefore, when the piston rod 2 moves, the extrusion rod 514 drives the second trapezoidal plate 59 to drive the ring 58 to rotate, which will drive the first trapezoidal plate 552 to move in advance. The inclined surface of the first trapezoidal plate 552 contacts the edge of the through groove 551. If the piston 51 is worn, the extrusion ring 53 has room to move downward. At this time, the inclined surface of the first trapezoidal plate 552 pushes the rotating tube 57 to rotate normally, and drives the extrusion ring 53 to move downward through the transmission to squeeze the rubber stress ring 54. When the extrusion ring 5 When the second trapezoidal plate 59 cannot continue to move downward, the first gear 511 cannot rotate, so that the rotating tube 57 cannot rotate. The force of the first trapezoidal plate 552 pushing the rotating tube 57 is less than the resistance. In order to ensure that the second trapezoidal plate 59 can continue to rotate, the first trapezoidal plate 552 drives the telescopic rod 554 to move inside the supporting plate 553 to buffer the movement of the second trapezoidal plate 59, which can ensure that the second trapezoidal plate 59 rotates smoothly and the extrusion rod 514 will not be broken. At the same time, when the rotating tube 57 is fixed, the movement of the piston rod 2 is not blocked. When the piston rod 2 is reset, the spring 555 pushes the telescopic rod 554 to reset, so that the inclined surface of the telescopic rod 554 slides on the edge of the through groove 551. The force generated by the sliding pushes the supporting plate 553 to drive the ring 58 to move, so that the ring 58 is reset.

[0030] like Figure 7 As shown, the disassembly assembly 56 includes a threaded hole 561 opened at the bottom of the piston rod 2, a fixed circular plate 563 fixed to the lower surface of the piston 51 and a through hole 564 opened inside the piston 51, and a threaded column 562 is connected to the inside of the fixed circular plate 563.

[0031] The top of the threaded column 562 passes through the through hole 564 and extends to the inside of the threaded hole 561 . The through hole 564 is connected to the threaded hole 561 via threads.

[0032] After long-term use, when the piston 51 is worn and aged to the extent that it cannot be used, it is necessary to remove the piston rod 2 from the cylinder 1, rotate the threaded column 562 to disengage it from the threaded hole 561, release the fixing effect of the piston 51, and then remove the piston 51 from the piston rod 2 and replace it with a new piston 51 for continued use.

[0033] like Figure 8 - Fig. 9 As shown, the oil filter assembly 6 includes an oil storage tank 61 fixed on the outer surface of the oil cylinder 1, a hydraulic pump 63 is fixedly connected to one side of the oil storage tank 61, a guide pipe 64 is fixedly connected to one end of the hydraulic pump 63, a three-way pipe 65 is fixedly connected to the other end of the hydraulic pump 63, a first one-way valve 66 and a second one-way valve 67 are fixedly connected to both ends of the three-way pipe 65, a filter frame 68 is sleeved on one side of the second one-way valve 67, and a sealing cover 62 is arranged on the top of the oil storage tank 61.

[0034] One side of the guide pipe 64 extends to the interior of the oil cylinder 1, the three-way pipe 65 is located inside the oil storage tank 61, the upper surface of the sealing cover 62 is provided with an oil filling hole, and a cleaning component 69 is connected to one side of the inner surface of the filter frame 68. The direction of the first one-way valve 66 is to flow toward the three-way pipe 65, and the direction of the second one-way valve 67 is from the three-way pipe 65 to the filter frame 68.

[0035] When the hydraulic gate hoist is in use, dust may enter the interior of the oil cylinder 1 through the oil filling hole, etc., and particles generated by the wear of the seal will cause solid impurities in the hydraulic oil. The solid impurities will form abrasive wear on the surface of the relatively moving parts, resulting in increased surface roughness and accelerated wear of the parts. When the hydraulic pump 63 injects the hydraulic oil in the oil storage tank 61 into the cylinder 1, the hydraulic oil enters the three-way pipe 65 through the first one-way valve 66, and then enters the cylinder 1 through the hydraulic pump 63 and the guide pipe 64. When the hydraulic oil in the cylinder 1 enters the oil storage tank 61, the hydraulic oil enters the second one-way valve 67 through the three-way pipe 65, and then enters the filter frame 68. The filter frame 68 can filter the solid particles in the hydraulic oil and concentrate the solid particles in the filter frame 68, thereby filtering the hydraulic oil. With each operation of the hydraulic opening and closing machine, the hydraulic oil can be filtered, and the cleanliness of the hydraulic oil can be continuously improved. The particles in the hydraulic oil can be removed to a great extent, and the solid impurities can be reduced. The abrasive wear formed on the surface of the relatively moving parts will increase the surface roughness and avoid part wear.

[0036] like Fig.10As shown, the cleaning assembly 69 includes an impeller 693 connected to one side of the filter frame 68, a third gear 695 rotatably connected to one side of the inner surface of the filter frame 68, and a second annular rack 692 slidably connected to the edge of one side of the inner surface of the filter frame 68, two cleaning brushes 691 are symmetrically arranged on the outer surface of the second annular rack 692, and a second gear 694 is fixedly connected to one side of the impeller 693.

[0037] The impeller 693 is connected to the side wall of the filter frame 68 through a connecting rod, the impeller 693 coincides with the axis of the filter frame 68, the third gear 695 is meshed with the second gear 694 and the second annular rack 692, and the cleaning brush 691 is in contact with the side wall of the filter frame 68.

[0038] The hydraulic oil is continuously filtered in the filter frame 68, and the solid particles inside the hydraulic oil will clog the filter holes of the filter frame 68. At this time, when the hydraulic oil enters the interior of the filter frame 68 through the second one-way valve 67, the flowing hydraulic oil drives the impeller 693 to rotate continuously, driving the second gear 694 to rotate. The second gear 694 drives the second annular rack 692 to rotate through the third gear 695, so that the second annular rack 692 drives the two cleaning brushes 691 to rotate synchronously, and the impurities on the inner surface of the filter frame 68 are cleaned, which can ensure the fluidity inside the filter frame 68 and ensure that the hydraulic oil is filtered quickly.

[0039] Instructions for use: First, when the piston rod 2 is opened or closed, the extrusion assembly 5 can drive the four first gears 511 to rotate, drive the extrusion ring 53 downward to contact the rubber stress ring 54, expand the rubber stress ring 54, and tightly squeeze the outer side of the piston 51 against the inner wall of the oil cylinder 1 to ensure sealing. The buffer assembly 55 can ensure that when the extrusion ring 53 cannot move downward, the ring 58 can still move, so as to avoid the extrusion rod 514 from being broken due to the huge extrusion force and being unable to buffer. The piston 51 can be quickly replaced by the disassembly assembly 56; Then, the hydraulic oil can be continuously filtered through the oil filter component 6 to concentrate the solid particles inside the filter frame 68 , and the inner wall of the filter frame 68 can be cleaned through the cleaning component 69 to ensure the fluidity of the filter frame 68 .

[0040] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A hydraulic door opening and closing machine, comprising an oil cylinder (1), one side of the oil cylinder (1) being fixedly connected to a guide rod (7), one side of the guide rod (7) being fixedly connected to a second connecting sleeve (4), the other side of the oil cylinder (1) being slidably connected to a piston rod (2), one side of the piston rod (2) being fixedly connected to a first connecting sleeve (3); Features: The side of the piston rod (2) away from the first connecting sleeve (3) is connected to an extrusion assembly (5), and the outer surface of the oil cylinder (1) is fixedly connected to an oil filter assembly (6); The extrusion assembly (5) comprises a piston (51) connected to one side of a piston rod (2), a fixing plate (512) fixed to the outer surface of the piston rod (2), an extrusion rod (514) fixed to the top of the oil cylinder (1), and a circular ring (58) slidably connected to the outer surface of the piston rod (2); a groove (52) is provided inside the piston (51); a rubber stress ring (54) is fixedly connected to the inner surface of the groove (52); a threaded rod (510) is threadedly connected to the inner surface of the fixing plate (512); a first gear (511) is fixedly connected to the top of the outer surface of the threaded rod (510); an extrusion ring (53) is connected to the bottom of the threaded rod (510) via a bearing; a second trapezoidal plate (59) is fixedly connected to the upper surface of the circular ring (58); a rotating tube (57) is rotatably connected to the outer surface of the circular ring (58); and a first annular rack (513) is fixedly connected to the outer surface of the rotating tube (57).

2. The hydraulic hoist for a miter door according to claim 1, characterized in that: The number of the fixing plates (512) is four, the first gear (511) and the first annular rack (513) are meshed with each other, the fixing plate (512) is located below the circular ring (58), the number of the second trapezoidal plates (59) and the extrusion rod (514) are both two, the extrusion rod (514) is located above the second trapezoidal plate (59), the cross section of the extrusion ring (53) is trapezoidal, the cross section of the rubber stress ring (54) is triangular, the hypotenuses of the extrusion ring (53) and the rubber stress ring (54) are opposite, the front and rear sides of the upper surface of the circular ring (58) are connected to the buffer assembly (55), and the lower surface of the piston (51) is fixedly connected to the disassembly assembly (56).

3. The hydraulic hoist for a miter door according to claim 2, characterized in that: The buffer assembly (55) comprises two support plates (553) fixed on the upper surface of the circular ring (58) and two through grooves (551) symmetrically arranged on the inner surface of the rotating tube (57); a telescopic rod (554) is slidably connected inside the support plates (553); a first trapezoidal plate (552) is fixedly connected to one side of the telescopic rod (554); and a spring (555) is sleeved on the outer surface of the telescopic rod (554).

4. The hydraulic hoist for a miter door according to claim 3, characterized in that: The spring (555) is located between the support plate (553) and the first trapezoidal plate (552) and is fixedly connected to each other; the first trapezoidal plate (552) is located inside the through slot (551); the oblique edge of the first trapezoidal plate (552) is in contact with the side wall of the through slot (551).

5. The hydraulic hoist for a miter door according to claim 4, characterized in that: The disassembly assembly (56) comprises a threaded hole (561) formed at the bottom of the piston rod (2), a fixed circular plate (563) fixed to the lower surface of the piston (51), and a through hole (564) formed inside the piston (51), wherein a threaded column (562) penetrates and connects the inside of the fixed circular plate (563).

6. The hydraulic hoist for a miter door according to claim 5, characterized in that: The top of the threaded column (562) passes through the through hole (564) and extends to the inside of the threaded hole (561); the through hole (564) is connected to the threaded hole (561) via threads.

7. The hydraulic hoist for a miter door according to claim 6, characterized in that: The oil filter assembly (6) comprises an oil storage tank (61) fixed to the outer surface of the oil cylinder (1); a hydraulic pump (63) is fixedly connected to one side of the oil storage tank (61); a flow guide pipe (64) is fixedly connected to one end of the hydraulic pump (63); a three-way pipe (65) is fixedly connected to the other end of the hydraulic pump (63); a first one-way valve (66) and a second one-way valve (67) are fixedly connected to the two ends of the three-way pipe (65); a filter frame (68) is sleeved on one side of the second one-way valve (67); and a sealing cover (62) is arranged on the top of the oil storage tank (61).

8. The hydraulic hoist for a miter door according to claim 7, characterized in that: One side of the flow guide pipe (64) extends to the interior of the oil cylinder (1); the three-way pipe (65) is located inside the oil storage tank (61); an oil filling hole is provided on the upper surface of the sealing cover (62); a cleaning component (69) is connected to one side of the inner surface of the filter frame (68); the direction of the first one-way valve (66) is for oil to flow toward the three-way pipe (65); and the direction of the second one-way valve (67) is for oil to flow from the three-way pipe (65) to the filter frame (68).

9. The hydraulic hoist for a miter door according to claim 8, characterized in that: The cleaning assembly (69) comprises an impeller (693) connected to one side of the filter frame (68), a third gear (695) rotatably connected to one side of the inner surface of the filter frame (68), and a second annular rack (692) slidably connected to an edge of one side of the inner surface of the filter frame (68), two cleaning brushes (691) being symmetrically arranged on the outer surface of the second annular rack (692), and a second gear (694) being fixedly connected to one side of the impeller (693).

10. The hydraulic hoist for a miter door according to claim 9, characterized in that: The impeller (693) is connected to the side wall of the filter frame (68) via a connecting rod; the axis of the impeller (693) coincides with the axis of the filter frame (68); the third gear (695) meshes with the second gear (694) and the second annular rack (692); and the cleaning brush (691) fits against the side wall of the filter frame (68).

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